Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca3d3268efd9682…

MALICIOUS

PDF

68.8 KB Created: 2021-02-02 03:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 697217538c071a40dcb3fa8e50c7010b SHA-1: 9863c367877c13f31ef7ed495139db9a4ddb5b79 SHA-256: 6ca3d3268efd9682e103ace66d8f07c365160f419c560aa4a6027f8bbbf8f437
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the ML classifier strongly suggests malicious intent. The embedded URLs likely lead to further malicious content or phishing pages.

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 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://crophysi.ru/123?utm_term=atoms+vs+ions+worksheet+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450625/normal_5ffcfc1264371.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/8735555.pdfIn PDF document text
    • http://help-copyrighteamservice.com/otamatone_how_to_playmk9ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5fd5f0026cfd6.pdfIn PDF document text
    • http://activa-fb.com/keighley_to_leeds_train_timesrskfn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_601147c7a389a.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/RvShahg/pasuronapukojinemine.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/iaLghhc/38658016701.pdfIn PDF document text
    • http://kopumiwabetare.66ghz.com/single_sheet_coptic_binding_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fd662220ae91.pdfIn PDF document text
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/vekoxajokope.pdfIn PDF document text
    • http://twitter-center.com/68508930669h0l86.pdfIn PDF document text
    • http://muluwusive.22web.org/fuxowamupezixotoxizisujol.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/Igfjcha/logo_quiz_expert_level_7_answers.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
    • http://jaxirelogalitis.epizy.com/cribbage_directions.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_off0000c31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31D 4780 bytes
SHA-256: d9b4a29b2b98b862fbb2054e54a99533cb9764b9b1a972b0c2fe3fcca0a54014
font_01_sfnt_off0000d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33B 10492 bytes
SHA-256: db62c9297feeef391339d503bb88deab5b7c4cb69da77648c7de87aa57043f8d
font_02_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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