Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3d877d43cfdc50…

MALICIOUS

PDF

72.7 KB Created: 2021-03-20 23:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5d6505fa169bf18d4fe2ebbe57eb3cee SHA-1: 19d06ea322a24020664c7dfda6eefe171f36a234 SHA-256: ae3d877d43cfdc508626672a9ec823bb8912d36b18c7e99b8abb9d67587f6caf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://dugedepap.ru/award?keyword=plural+nouns+exercises+pdf+elementary PDF link annotation
    • http://lnstagramverifiedbadgeservice.com/28746875549jasjo.pdfIn PDF document text
    • http://saduzemed.mypressonline.com/ponaremomotuwin.pdfIn PDF document text
    • http://allostar.buzz/north_face_women_s_jacket_size_guideengs5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_601dde2dbd20e.pdfIn PDF document text
    • http://sinoxaju.mygamesonline.org/silusanevatezidapuser.pdfIn PDF document text
    • http://sk-anker.ru/best_free_tool_to_create_architecture_diagrameypm2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460228/normal_5fedda5aee46e.pdfIn PDF document text
    • http://study-english-05.site/kitchenaid_artisan_mixerba9o0.pdfIn PDF document text
    • http://sewonmedix.ru/how_to_install_cosco_car_seat_with_seatbeltwgvc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381962/normal_5ff967e07d7c7.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/zetivujukod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_5b621d113b7746d79874e63dcf49fa26.pdf?index=trueIn PDF document text
    • http://fobixejavol.rf.gd/bowflex_treadclimber_reviews_consumer_reports.pdfIn PDF document text
    • http://wubezirinipo.epizy.com/28785542240.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_78f986011e87470382129a721427f923.pdf?index=trueIn PDF document text
    • http://gipozuzuwito.rf.gd/11885182781.pdfIn PDF document text
    • http://lotirejotan.rf.gd/canada_visa_form.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_dfc608b89a47440ebaceaf6b82df1b7e.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_6f722867a21645e5bcd906ff3165475b.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_567776c1bc1b4160bb31c28e95ab15cd.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 5472 bytes
SHA-256: 4b43e5358b44fc0b2eab60024d37880158f0558883db6ce90bde75f5a8e29481
font_01_sfnt_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 10412 bytes
SHA-256: fe2a2eb7a081965ab761d98334cc721ba66fb94006dd8f320f25d736709aa58c
font_02_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 16076 bytes
SHA-256: c26df5a654703d82c4b49e3d99d7624c72720c83e2144c41d2616ef18af3c653

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