Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af4992e267a5f8c…

MALICIOUS

PDF

86.3 KB Created: 2021-05-30 22:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 89912af3f57c90c8d10ec5259a000777 SHA-1: d1abda031dab136775286554824b9e2c7fdf9b6a SHA-256: 9af4992e267a5f8c639729b923af3a2a21f37fe9175602a3563b0e6516f22542
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'cpm geometry connections answer key chapter 6', suggesting a lure for educational content. The presence of multiple PDF links and a redirector indicates an attempt to lead the user to a malicious site, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly support the malicious verdict.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/strik?utm_term=cpm+geometry+connections+answer+key+chapter+6 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_600e6ef93ca17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_5fe6559774607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_60634244b28e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393022/normal_5ffd9be65908c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_60640ccd2d3a8.pdfIn PDF document text
    • https://poxefapujo.weebly.com/uploads/1/3/5/3/135312596/285341.pdfIn PDF document text
    • https://dexugagemer.weebly.com/uploads/1/3/4/7/134715037/3813724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444358/normal_5ff56c90633f1.pdfIn PDF document text
    • https://birakegisepes.weebly.com/uploads/1/3/4/5/134597855/7b9f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465935/normal_6033fd5379379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad123e0a-59bf-471d-960f-d93c6a6e1127/sokanav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77958a1d-ab6b-438c-9619-2b925d560476/58994490199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5da1497-e458-402f-8b62-5cf80a35b7a8/lodote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896fd908-4548-4a1b-a09d-a7439de34bf3/nogomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d252e3cf-7a7b-4c7f-b577-a305b8fca7a4/zakofapej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ca0a06-664e-46e0-97ea-38f2544d92c9/balancing_chemical_equations_worksheet_answers_1-20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef121a4-a1f3-4882-83de-a7b31ba48f3d/hayward_salt_cell_warranty_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b075c4-7f1a-4996-a359-a874ab4a399b/cyberpunk_2077_ps4_pro_patch_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf8ad94-eca6-4534-9d7f-2cb9e1edfba3/18456031633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4153ff7e-115c-4462-922a-84222c7a4c60/302478941.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 5632 bytes
SHA-256: db9df56e9cea33d5176383683ab8273613f2c142101d261c0cd98ddebe588194
font_01_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 12108 bytes
SHA-256: 9f67dbf27f97a83f32dffc02f7fb898c6f6bacd0fbcfc63427f415fc9ed803bf
font_02_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 16072 bytes
SHA-256: ab6a2d92c6195441154fe03e3add47570783810922a3b82dfc3833ffb97f5f96

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