Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fd1a9fd5099798…

MALICIOUS

PDF

78.8 KB Created: 2021-03-12 09:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6eaab1daa0f22fe667c24caf8b577d46 SHA-1: 5d4071d477828370e019af38401993861f0ccbb2 SHA-256: 83fd1a9fd5099798928e96316582df46d8a33fa93234c71005ba34941b430df3
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a sophisticated redirection scheme to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=sat+biology+practice+test+khan+academy PDF link annotation
    • http://xemokajoled.medianewsonline.com/94010640701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_602cdea4011aa.pdfIn PDF document text
    • http://compte-cmbretagne.best/ketewukunanis8ql6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472206/normal_603a927305beb.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/what_is_the_symbolism_of_the_yellow_wallpaper.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/how_to_write_a_short_film_script_example.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/whirlpool_cabrio_5.0_washer_reviews.pdfIn PDF document text
    • http://sallehub.xyz/198123479942y9t9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_602aaa81af8bb.pdfIn PDF document text
    • http://gufutaca6.xyz/what_is_organisational_behaviour_in_managementquaae.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/61317899406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fd09345d7d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_6048956907dbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91c7e36-ccd9-48b3-b596-5f947732c8c0/juxoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f21188-d40d-47a2-a14a-5d0fa1decc95/joseph_and_the_amazing_technicolor_dreamcoat_junior_script.pdfIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/swann_security_camera_system_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b65f23-a65b-4c2f-9a42-5c06f2d08bda/xikekimuzamexufexut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30cc42a1-8355-45dc-ae2f-a330f073d1f1/nowoxasoba.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/26594177286.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/18757702084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc46ab1c-3d4d-4ae1-aed2-482f952abee9/emotional_intelligence_daniel_goleman_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/fixekanegod.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 5896 bytes
SHA-256: 85f5938daad5adb1319d57beaed2297dfce7dc9b238bfc961b0327a946d421b4
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 10668 bytes
SHA-256: 21ee5b12f366669cbec34a05dbffcdf3c39c0d0f14d4dc9a135be91e222a4112

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