Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e2857624746042…

MALICIOUS

PDF

69.9 KB Created: 2020-11-16 20:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7d271c41da80c3626d6d6a307993c243 SHA-1: 4f30af2ca6de8318d126867ca2512c1bc064954d SHA-256: 57e2857624746042c549dc65fffd095f5bf733f1b45f22a63593eecfe218a55a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO spamming operation. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate a deliberate attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=pinnacle+high+school+football+alumni PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5f965d1da2284.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rezareludufiven-voxodopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_5f977cf69aac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408706/normal_5f9958f8aa42d.pdfIn PDF document text
    • https://diboboxu.weebly.com/uploads/1/3/4/3/134330346/7259925.pdfIn PDF document text
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/2560304.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/jadurudivifon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/seperiramotulezoxivozisin.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/ib_english_language_and_literature_ioc_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/dugevediwawapipemir.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/how_to_get_a_discord_id.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/land_of_stories_book_3.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/99271710467.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_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 5340 bytes
SHA-256: c17438bda19e858531881013a81dd46a730b1037f69c2682def5f423ad265969
font_01_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 10068 bytes
SHA-256: 2697f3769f08a996b81d435dcbe5261cb0cf8c0d1225a4dcfd8bdb219db35e6b

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