Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5d9efd20cd2330…

MALICIOUS

PDF

87.3 KB Created: 2021-03-24 11:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9259df967010c11c88d879c3d06879c2 SHA-1: f1f2a81b8857cc3888f192d14cd2d5a94a85def7 SHA-256: 3e5d9efd20cd23303172013c803ee82f315c5f761a7f35526fb9f18b7a4fb226
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The primary malicious URL identified is 'https://midufefew.ru/award?keyword=betamethasone+celestone+davis+pdf', suggesting a link farm or phishing attempt disguised as a document. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/award?keyword=betamethasone+celestone+davis+pdf PDF link annotation
    • http://fidekeleko.medianewsonline.com/absolute_threshold_in_consumer_behaviour.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/Knhaje9/formula_1_live_updates_guardian.pdfIn PDF document text
    • https://cdn.sqhk.co/sevimifogu/RDSgfii/48870548387.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/ibShjhN/fapufetatapofawufap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_36ce20449c7a440090183b7bc5847d08.pdf?index=trueIn PDF document text
    • http://nakeviw.myartsonline.com/que_es_dieta_cetogenica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fca228-9f7a-4f2e-b0e1-252d4ee88896/43452229542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd149da-1606-4692-8d09-22eb39964532/99344493420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df9295a-3a44-46b3-9668-a2ef9706cf34/necchi_sewing_machine_feet_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b46655-0351-48f8-9cbd-3e54500db6aa/dark_souls_3_quality_build_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e59aaf-4668-4490-b059-aa39181e32cb/64725245237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb679e7-5340-4951-8016-7bb075ef6925/how_to_put_vicks_pads_in_humidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6229ec7-c8d8-4955-bf81-86a5f3d63eea/14137244040.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_d1c7a39ef9154e1e9d461458e71766e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d57d40d-3d78-4172-8837-173673f923b5/life_changing_magic_of_tidying_up_vs_spark_joy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11795df1-6f09-482f-9d90-96547255dc5b/32930398718.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_b78ef62e1d414c61b708157f7d10d2e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8fa352-501a-47b3-82ca-6ade7313ffb4/giants_in_the_ohio_river_valley.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_e2ad90cfc6b34f0fa0d8eb2faa74152d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1504a3b-baf4-4d6c-a926-4f4313888ce5/tijupizusarupaxo.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_7d286f603a81403da30f5a7c7cf1f134.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f63822b-bf75-458d-9951-255a50b2dfaa/the_summoning_kelley_armstrong_epub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228ab179-219a-485f-a7ec-890967d4982f/dawadoxogene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/675bca1e-7377-40e6-b8ed-3ad1554f2aed/somesixuwirikotowe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 5196 bytes
SHA-256: 08d082d826797a608effefff5732fde91c12e8d62638daf395642a60b8dc5ea3
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 12108 bytes
SHA-256: 1c6c97d00f75853d3532bc3b8cfd194b23c6a9a33e92de86ff72f794c6563631
font_02_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 16160 bytes
SHA-256: 71965a19a7f9335088809374b0d641e6d4a160bd395340b351c68b22b5e6656e
font_03_sfnt_off00014139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14139 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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