Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf10b37e8d103b1…

MALICIOUS

PDF

92.4 KB Created: 2021-01-03 11:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 82aad476b9193093098fdf1f0218bd88 SHA-1: 41ebb576bd5e7499f07731147c18d779e5d0008b SHA-256: 0bf10b37e8d103b1c20803a8588c31032400e23bb71301900e42961dc6dea104
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/aws?utm_term=figo+misoprostol+guidelines+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fab5a141ed5f.pdfIn PDF document text
    • https://cdn.sqhk.co/xetajikok/lElii6I/21010304137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5f95a708b723a.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/jifonisalu-xejefijufoni.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/1852210.pdfIn PDF document text
    • https://cdn.sqhk.co/rebiguta/4giicxk/23276708602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426695/normal_5fcfad107acb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417216/normal_5fb967b5cace6.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/dariboboridoso.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/6f839d05-55ed-45a6-9cd8-4d4a6bc2c5a1/9168202490.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/lulobikiguto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d940861-ad1c-4f58-9d7b-3e8a1bdba28c/90290002742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f0b1a3-f4bb-46ae-98d0-e36aefd8b21c/33324988713.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/wabafotunajobulidukoxopo.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_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 5544 bytes
SHA-256: 44eb0f98d1950104f3f41edba6b9aa7b9333b535fd9f26b183ef0ba1c8ae7308
font_01_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 14492 bytes
SHA-256: 16c480390338aeaa355076402543e4ce6097ee2de645fe95fd2bc1bb7314f30f
font_02_sfnt_off00014ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF8 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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