Malicious PDF — malware analysis report

Static analysis result for SHA-256 411aadcc7f3ff169…

MALICIOUS

PDF

75.4 KB Created: 2021-04-02 08:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 707de883ce76c7c10a1c85d068bf4866 SHA-1: eff688cd49f8914d43e7765f757f16aaecf1ac8c SHA-256: 411aadcc7f3ff1697532f9be5496e927e291df16bbe22fbdc360a68d43054f00
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, embedding numerous URLs likely intended for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with a spearphishing attachment used to redirect users to malicious sites.

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://xezojetit.ru/123?utm_term=arduino+tutorial+pdf+francais PDF link annotation
    • https://cdn.sqhk.co/zibavuna/gdM8Ohi/80216072368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_6047facfba589.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5fc65e6a03cf8.pdfIn PDF document text
    • http://gurebenuzasa.iblogger.org/blown_to_bits_chapter_5.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/jeiaWhf/bekesavo.pdfIn PDF document text
    • http://takojebuti.iblogger.org/biret.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408718/normal_5ffb40f1792b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483349/normal_604db995b1734.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/gwjhgff/38827772758.pdfIn PDF document text
    • http://zibinonoja.22web.org/61793542035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_5fd679f3cd5bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_604ce8e4c7556.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://malinaliwul.epizy.com/mimojixetemubipebo.pdfIn PDF document text
    • http://winulesodix.rf.gd/29731592158.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_98a7e4cb053346c79b352703e656aa4e.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_bd71ef62f06e4f4bb185b074dada597e.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_42f6854857f946739519bb3263ff3122.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_b1c18cbcb89546e8bd54e028be3e1788.pdf?index=trueIn PDF document text
    • http://giwigevo.rf.gd/diregibu.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_4632031ccc3845af800abb0211d3ea2d.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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 5140 bytes
SHA-256: 5b0b4829f858dfdd19638731c296f15a35422e485e81f2d36b833fafe17e2e80
font_01_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 12572 bytes
SHA-256: c70207bb267e3869ae2941ea640a8aee6e6cc00997596269beece11d65bac79e

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