Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6ae174b3f6b4f8…

MALICIOUS

PDF

75.1 KB Created: 2021-03-23 15:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ac83d27edd34731bb3de588ca7c49371 SHA-1: 91d6b7e61f8c72971ca4220a66273478d8d00357 SHA-256: 7c6ae174b3f6b4f80e9fc7b5055d012f291b04b443eb708fb853a44496907411
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 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.
  • 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=basic+english+tests+pdf PDF link annotation
    • https://cdn.sqhk.co/xuxumududu/YghG7jg/fire_red_pokemon_mansion_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480162/normal_6040dca26a6a3.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/gIfibjj/suketozujepixujapume.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/V9hhifh/belasaganoda.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/Qhichdy/beastie_bay_magic_word.pdfIn PDF document text
    • https://kanapajuzusuma.weebly.com/uploads/1/3/4/5/134589940/7950861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_6040419c085c1.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/giGhjYK/13562107633.pdfIn PDF document text
    • https://lutilizifaguno.weebly.com/uploads/1/3/5/3/135316604/3a266f17ad25.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/iMzibib/xejujuzedamojevos.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/iifwgfS/77879810847.pdfIn PDF document text
    • https://cdn.sqhk.co/naxokujim/hjjXjdL/70448816478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_60550a57e0a7c.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/c204a31f-4758-4861-a693-f428ed9a9f29/69152721010.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/42684629496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40087dde-bc61-428a-a1a1-169e461916da/call_of_cthulhu_7e_keeper_rulebook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/shakespeare_the_tempest_act_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a25ff6e-0f7b-4caf-a6bc-e1cf5217b136/food_safety_guidelines_temperature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4480b823-c9d6-4a42-bc53-a2c53f0ebc9c/tozoxizirarabag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db55e2a-1b51-45b7-a731-303f388c61d7/24898056447.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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 5368 bytes
SHA-256: bf928f2e9a0e43e59ca087b378e2307eb1f5dfcb42a99c537e3c8867ef074d1e
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 10668 bytes
SHA-256: 5164ed2eafe17be57700c0c456cb233bbe1f6d08bd9ef48bf57092c83cf569c8

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