Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f67437a7c0f32d3…

MALICIOUS

PDF

69.8 KB Created: 2021-01-31 01:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: aecfa9a6da0f727d6b1d1efdf514bd30 SHA-1: bd9bc856409a06fc5b29968de7df7b9027672cf2 SHA-256: 6f67437a7c0f32d3fb348321a9916a9a80332afa5c2588231470e71c432008b5
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and link farms, indicating a phishing or SEO manipulation scheme. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

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
  • 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.
  • 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://crophysi.ru/123?utm_term=gillian+welch+the+way+it+will+be+chords In PDF document text
    • https://cdn.sqhk.co/xedasuzefer/almhejj/waste_management_cdl_jobs_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504791/normal_600d8f62b99f1.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/cA5bHbj/kerugagazanirewepad.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/xgdxaqt/tomun.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/kididgh/82096473954.pdfIn PDF document text
    • https://peruvapi.weebly.com/uploads/1/3/0/8/130813059/4916148.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/722da42e.pdfIn PDF document text
    • https://nofogiso.weebly.com/uploads/1/3/1/3/131398128/sonomoxa_pusulima_nusogu.pdfIn PDF document text
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/d90cf4ef2.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/Xjajb4o/studio_pets_photo_booth.pdfIn PDF document text
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/fibuzudisekofa_sozeri.pdfIn PDF document text
    • https://zazigiwozaka.weebly.com/uploads/1/3/2/6/132681333/gadedero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_600c35f7f29d7.pdfIn PDF document text
    • https://cdn.sqhk.co/dabigewom/0F1ryha/zanawixemevemavumeremoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_601394c3f0e0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 5392 bytes
SHA-256: db58d38cc9f286777ac6bbc12bbc6dd19bd87bb71bc9077f2a1d9ab6b8ab13b4
font_01_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 10896 bytes
SHA-256: c58838fe944dd534c2dc7df348fccd9550e0b3a06b1e4d44ffc785dbe2625108

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