Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b3ed0cf52b7b17…

MALICIOUS

PDF

75.7 KB Created: 2021-04-29 19:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 85fe94453e5bbee8908b10c7941a7dca SHA-1: eaf2c8d030bffb661949ef7f6c1125db27aacb26 SHA-256: 61b3ed0cf52b7b17965395c8da84e8d471f45e4bd19f5f77362b1549a2cbb572
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=2004+ford+focus+hatchback+specs PDF link annotation
    • https://cdn.sqhk.co/lobinazema/jgdgjjg/62443061552.pdfIn PDF document text
    • http://falisekivi.iblogger.org/automotive_engineering_books.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/aPCjc4Z/getosuwukoz.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/51mhehg/ledesuxovamep.pdfIn PDF document text
    • http://tarezirok.mypressonline.com/ginufin.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/lGjjjdP/gif_to_video_app_free.pdfIn PDF document text
    • http://kamodokawi.iblogger.org/arifureta_shokugyou_de_sekai_saikyou_novel_indo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_7eab5ab3234a4969a48d1a6a0df2d091.pdf?index=trueIn PDF document text
    • http://gixopiv.onlinewebshop.net/55613435142.pdfIn PDF document text
    • http://suginuzebaluwom.rf.gd/syntax_tree_diagram_examples.pdfIn PDF document text
    • http://nunoxemimo.rf.gd/51402017686.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/62597427308.pdfIn PDF document text
    • http://gumomexad.onlinewebshop.net/metal_gear_solid_5_phantom_pain_gameplay_ps4.pdfIn PDF document text
    • http://virefixifefuke.epizy.com/aha_htn_guidelines_2019.pdfIn PDF document text
    • http://gevazobi.rf.gd/amd_radeon_r7_350_review.pdfIn PDF document text
    • http://pekinomigaw.epizy.com/libewusital.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_a7ad23cb97524bb3ba8bd184ed742c8a.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_918675bbd7f940e49e483bf28126b9f9.pdf?index=trueIn 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_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 5684 bytes
SHA-256: 4036abeef4df14d9d214f701748694145800ffc4c37ab221269308449bb17b6d
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 10424 bytes
SHA-256: 0e97eaeae71c2e837e637442eef7971c0f4bf18f8cc988c00455796cf6942235

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