Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7eca7f75657699…

MALICIOUS

PDF

67.1 KB Created: 2021-04-04 13:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 519c4249c924e4f1b7f254c1ac387a21 SHA-1: dea68e08e44df2d66d75c6e3f33e725f96b32ecc SHA-256: 3d7eca7f75657699541b5d0337a329b9e3d928a9b25d078a79513dbf658a7322
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 0.9998

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://xajibur.ru/strik?utm_term=george+herring+america%2527s+longest+war+pdf PDF link annotation
    • http://lokubakodo.getenjoyment.net/buvidonetazebiv.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/fikid.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/b3idzfM/61442220533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_60522447479a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_6043f7577c07d.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/pakitovedugozav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_605b224fb1cdd.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/gzVNgin/bunaresugarelurifipazuku.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/b46e79a1-8e12-4194-a9b1-0d5c4d8ad084/60343619239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ecf27e-3a85-4631-a3a3-39956d3487eb/love_has_no_limits_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d7fc9f-d5db-41e4-99e5-52b6495fecec/what_are_inferential_statistics_questions.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_171cdcbad8294e13bdf95c54081786cd.pdf?index=trueIn PDF document text
    • http://zuxakenupe.epizy.com/fumatipasotidiwewop.pdfIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_6b2c9711d0134216808d845fe943bf46.pdf?index=trueIn PDF document text
    • http://zuputes.atwebpages.com/oxford_discover_grammar_student_book_1.pdfIn PDF document text
    • http://lakelasu.rf.gd/formdata._append_not_working_in_angular_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7062d1a-c019-423c-aa0e-ad38ae95e471/how_to_use_pivot_points_in_trading.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_off0000c758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC758 5724 bytes
SHA-256: c47a75fc1528b478e66481eb1018e444ebc888f20ba39765d08205c8d7511c4d
font_01_sfnt_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 10588 bytes
SHA-256: 9004326778c949ba0810a69c82348728982827c1384d2c055e43348731c554d8

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