Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cd89d6640f54fa…

MALICIOUS

PDF

80.1 KB Created: 2021-05-23 01:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1a23a8d13dbfb9348fc0e204fc57c49c SHA-1: cb9fec2a27f37fe25349295e40b8eb55d744bed4 SHA-256: c7cd89d6640f54fa47a40732b3fce7f3daea175ef62cb180df8ac17762db7aad
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://golowaki.ru/strik?utm_term=sheep+brain+labeled+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466664/normal_606e2ccee443a.pdfIn PDF document text
    • https://wawawafux.weebly.com/uploads/1/3/4/8/134896626/refivizepoloxo_putagaxaf_debad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_604f3aef8c491.pdfIn PDF document text
    • https://keguvetazako.weebly.com/uploads/1/3/4/7/134702613/wulakiwitese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5fd9b0d9977b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480161/normal_6063c529b65b2.pdfIn PDF document text
    • https://xikefopu.weebly.com/uploads/1/3/4/7/134748362/vopitawa_nubiz_polelufuwapom_fijax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_6010253b1ed13.pdfIn PDF document text
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/tokarevedem-sixizizuvarix-bamezolezepipez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489237/normal_5fe0bb004aa86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_602f2635e5c3c.pdfIn PDF document text
    • https://zozijopese.weebly.com/uploads/1/3/3/9/133997316/28bfbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402951/normal_5ffebfe6cd96f.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://s3.amazonaws.com/juzewojavomofew/craftsman_10_inch_radial_arm_saw_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38d7ef5-b7ed-40e2-9d55-e3c53cba7d40/89069553992.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/management_of_dyspepsia_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/30877310397.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/star_trek_movie_2009_green_girl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd7fc87-e19b-4232-970d-7aa9646e881d/exercises_simple_past_irregular_verbs_negative_form.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_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 5144 bytes
SHA-256: 5d9b9bb0921925e5239c7962d3061e480e0dc431b0595bc5edc85e869721c6a7
font_01_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 11216 bytes
SHA-256: a3a3dfc6f1106eb2876a48dd6e74f2cebf33195a6949828c6bb2deefadcd0283
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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