Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b5152fb53b6141…

MALICIOUS

PDF

78.9 KB Created: 2020-12-07 23:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 508a48151cf9f28be99bcd8d0e37ec75 SHA-1: 00d57e0b8aa16643f21e83314787461e78351159 SHA-256: 41b5152fb53b6141467682d6e6eb38359651857bb41d520d0935c87272cd7995
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a tactic to manipulate search engine results or redirect users to potentially malicious sites. The presence of an external URI pointing to 'trafficel.ru' and a ClamAV detection further support a malicious classification. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafficel.ru/123?utm_term=solve+for+x+calculator+mathway PDF link annotation
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/1770092.pdfIn PDF document text
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/rudosozibufig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f88a88e8a48c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453117/normal_5fcbdc4291006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411491/normal_5fae00b147416.pdfIn PDF document text
    • https://zokagagewawo.weebly.com/uploads/1/3/4/3/134346606/gujexika-pabolutome-nikopajeta-nekexek.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/sugaguxagu/double_discounts_chapter_7_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8deae3-9c18-4dad-9d54-1f142cc6c2d3/manual_geladeira_brastemp_clean_zyrium.pdfIn PDF document text
    • https://s3.amazonaws.com/padoragog/charlie_brown_seafood_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9278089-5bc0-4871-9d1b-b5221530ea02/mibewokugaxekusom.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/pigipegatomotegiperipif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00010c1-a25d-4d09-aa3f-da472dc8d7e1/wazemumelo.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/afinidad_electronica_de_los_elementos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5537d24-48b0-4965-b0f5-af718bfb0aee/32987106698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42017db6-ef8a-4f98-aaa7-16197d7b53ba/a_negro_nation_within_a_nation.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_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 5368 bytes
SHA-256: d5077bb9c2384834d8f4bdc2b67bfb88fd665a7d13fed95a6c9fe7be2b132699
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 10940 bytes
SHA-256: 6e84e0300a3360a07b6cfe73fe326c1eb366e8a81a18bc50ffcf34bff355c092

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