Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa7b2cc0cc85d34…

MALICIOUS

PDF

68.3 KB Created: 2021-02-15 02:36:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6147d38f5fa033cde83a857c52843915 SHA-1: 8b737efb588f244beb2b1ac4ba4980a47564a050 SHA-256: 7aa7b2cc0cc85d34159fef8dd05b8def784aa9b640ce57bbb013cc28bdebb89a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt.

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 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://jottigo.ru/wix?keyword=grande+eres+tu+grandes+tus+milagros+son+lyrics PDF link annotation
    • https://cdn.sqhk.co/wujukipako/2ihrghM/skater_boy_clothing_stores.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406455/normal_5ffbeb86bd24a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366354/normal_5ffe1cb8ecc8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473919/normal_5feb04d7b3476.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/wuxometusur_garilowowu_jezunuresu_zamusilowo.pdfIn PDF document text
    • https://jufozafofover.weebly.com/uploads/1/3/6/0/136050361/kawiwixufexukor_napejotemo_dusiwuronoresuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5ff193de9d5de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_5fd1215585b84.pdfIn PDF document text
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/kelozosusim.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/c4YYnLq/the_building_game_realestate._com._au.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5fd64d9210a7c.pdfIn PDF document text
    • https://cdn.sqhk.co/lilajibusizu/Gl1gfrV/birunadokivakejaguxapow.pdfIn PDF document text
    • https://vawoxaju.weebly.com/uploads/1/3/1/3/131379227/zomanoje.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/cQgdidZ/28624241789.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/gidjiEi/72385173456.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32C 5392 bytes
SHA-256: 557e3a7ac5ed35be7e27d5cf42b3477d2da29a05dfaf0181f2924d3933ede498
font_01_sfnt_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 15672 bytes
SHA-256: b2d56d854b5f8e73c3d7c36759a0070204209a59a09caaf74180205f788b52ba

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