Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de9d8283c53febf…

MALICIOUS

PDF

76.7 KB Created: 2021-03-15 07:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b1827d9eaac209d206e7eb4d4f6d784e SHA-1: 1c0158710f84beedb50e7fd5d51c9d069bde1d2c SHA-256: 2de9d8283c53febf16a7cf110e7aa07050649a2d5f3fc67f12c5f55f523ab5d1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to installation manuals, aiming to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://leonvi.ru/wix?keyword=bakers+pride+y600+installation+manual PDF link annotation
    • http://paxejunon.mygamesonline.org/john_deere_x304_bagger_attachment.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/woduvapomameved.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://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_02a2dafecb37467cb12f79ea2d1bbe70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44fe089-887c-4fd7-ab04-babee1990e16/gakedifosuvipi.pdfIn PDF document text
    • http://wiloradakuno.onlinewebshop.net/kumeruzazufubowiboju.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_b20de296a3c04834a38cddfd6355be79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufexa/ad_free_browser_android.pdfIn PDF document text
    • http://bibezakomi.myartsonline.com/anime_characters_stronger_than_one_punch_man.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_eaea235fa888422ba5fe7e3cc6f5f229.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea831d2b-6300-46e7-90f3-e3b2f4bbe3fc/braun_thermoscan_ear_thermometer_with_exactemp_technology_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a248f269-9703-49ab-ac45-58e20fd2f88b/motorola_mt350r_earpiece.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/lawn_maintenance_estimate_template.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_fc4fc59218884778b09f80cc38a46a73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3511727e-29af-4fc6-838a-b6b89a3342d1/tanetijukezuzod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3f30cf-5757-4cbe-886e-9ee903e64036/grounded_theory_analysis_meaning.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_9d87ccd0141c469ba068610097f5928f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/lc_geography_sample_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177b2834-6b5f-44a8-90a2-c12d5c57d9dd/psychology_of_religion_and_spirituality_graduate_programs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f30da4-8a27-4c25-91b3-a832432f1909/navazesikisapalamejukugos.pdfIn PDF document text
    • https://ce419959-236d-4487-89d7-67f356bda573.filesusr.com/ugd/147b51_01530c2f4f9f4486af6d299384899b09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0dce8c0-8d20-4a36-b74d-d481562809e5/33029725446.pdfIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_6333bf75457941e0a94ae43b2d0f3fbb.pdf?index=trueIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_fb83c137d5c84b2bb5a9d80164e76eb7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/besafefaf/31797672671.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 5500 bytes
SHA-256: cfddd31627ce82e0c3dd068984276eb58ec925a28f208dd110272ddcd03bc18b
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 10956 bytes
SHA-256: 76243f898de434b506838c386971b8ea9c154a1a9624aea8a667edce0495a5f2
font_02_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f