Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c806fa79d4bb02…

MALICIOUS

PDF

81.6 KB Created: 2021-04-02 19:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bf03e3315ed2be996f484eb9c1fdf437 SHA-1: 4efa7d915a04e60336bf281027e0711844ad5426 SHA-256: 29c806fa79d4bb02ad5e7d2937eafc3438332962ba19a900a0023248acc4ac13
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://botokaw.ru/award?keyword=oracle+sql+queries+interview+questions+and+answers+for+experienced+pdf PDF link annotation
    • https://cdn.sqhk.co/kenoramof/xibjetI/womota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459926/normal_600fac364fea2.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/BidIJhj/tamil_police_radio_ringtone_mp3_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_604fbbce44c73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387815/normal_600110e74deaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_60411f713f59b.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/iggieig/slacker_movie_quotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_6011d9c6951e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_60299e431ab0f.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/jhjWgiY/insurance_coverage_incurred_but_not_reported.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392877/normal_5fc7121eb8c31.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/fSLgvhd/download_game_zombie_diary_mod_apk_android_1.pdfIn PDF document text
    • http://famekeletiti.iblogger.org/52468117480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481270/normal_5ffb8f0e9a994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_bb2aeb869650485ca6d9b9ed6277d60a.pdf?index=trueIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_efebfd19c4364e488e6cd6f38f5364a0.pdf?index=trueIn PDF document text
    • http://bufiziwo.rf.gd/motipavupobomareza.pdfIn PDF document text
    • http://jijopefugowebe.epizy.com/40092344746.pdfIn PDF document text
    • http://puribobelumisi.rf.gd/online_converter_to_image.pdfIn PDF document text
    • http://zopijovek.rf.gd/how_to_fix_blank_screen_on_honeywell_thermostat.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_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 5524 bytes
SHA-256: 21c9d93c4b2a6c12e378df3d75117bece5499126fd550c31fe9935e325bb9a84
font_01_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 11096 bytes
SHA-256: f12268a2f0334cc49f46b4f8581d6167102d2f2a13f19db0221b1491ffba59db

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