Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1396b1548b5ea4c…

MALICIOUS

PDF

74.6 KB Created: 2020-12-22 12:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 98b21e0097dba6cec2812d296452f307 SHA-1: 6d56200b89dd02815029bfc2b6a111116f130672 SHA-256: c1396b1548b5ea4cbed65cc9c939f2c8600bc5ed24f3df11bb2b92a08b19b5ce
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of links intended to manipulate search engine results or direct users to malicious sites. One prominent URL, 'https://traffset.ru/123?utm_term=7th+grade+social+studies+teks', appears to be a lure, masquerading as a search result for educational content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://traffset.ru/123?utm_term=7th+grade+social+studies+teks PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487618/normal_5fc963087398f.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/mugunovafepibi-xozavobakusure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_5f9f57e09160f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f8d110c60168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_5fd2b0dc935d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465394/normal_5fb406534e095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f8b48e8bdd58.pdfIn PDF document text
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/wefagunof_deporeli_wivowaxemupid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8b7195d53d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_5fdba89f1c94a.pdfIn PDF document text
    • https://folesatabija.weebly.com/uploads/1/3/4/4/134441350/ruratasobedok-wuvilafusatusup-rimogavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_5fb98631aaca6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfc1e64be903ae6404bf7/1606220831156/graph_of_cube_root_of_x.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/98907902453.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc128c411f6a419848742fc/t/5fcb005c26a2be7f6ddc589b/1607139421475/invaluable_experience_and_knowledge.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/alone_piano.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 5024 bytes
SHA-256: 2ea0f69fe0de09a804153459a29ea02b0dc83e6df57f38f29b87d8182cad6d4b
font_01_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 10752 bytes
SHA-256: 9c7b2ea88a45fcb3f5c50f145b27819625ad67c9e4b69eb3b05df88422728eda
font_02_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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