Malicious PDF — malware analysis report

Static analysis result for SHA-256 b827d466738b5261…

MALICIOUS

PDF

82.8 KB Created: 2021-03-23 05:03:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a3237ccedda89c409d7a2781a73fcd97 SHA-1: b17a6743d118c943af90d5c05754c89843d05cbd SHA-256: b827d466738b5261425fb0e470c2858fa6ecaefbad06d7498d86e830de835a10
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which lead to disposable hosting or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, aligning with common phishing tactics.

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://dafemum.ru/strik?utm_term=line+6+pod+hd500x+review+ultimate+guitar In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_604a98edb31d8.pdfIn PDF document text
    • https://cdn.sqhk.co/parepejapoki/mji0yp5/tiwirijabitisasozumudeko.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/hbhamhe/animal_jam_unblocked_login.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/likezog-peret.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/thGghGs/masedo.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/KPhhc1V/nasal_congestion_covid_19_treatment.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaluwozez/NiegfiS/word_bliss_all_answers.pdfIn PDF document text
    • https://jebowevut.weebly.com/uploads/1/3/4/4/134493782/3136298.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/hgjgjhz/11950245743.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/cJdgcjh/janujudumov.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/TuihMDm/earl_of_sandwich_tomato_soup_nutrition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_604b4f5ea303a.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/6202331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_9713d3a2e359457eaf0197da28903dc6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mutirexa/extended_essay_history_subject_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/what_does_critical_article_mean.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_e9633638a1cc4f51877c1de7d63719fc.pdf?index=trueIn 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_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 5776 bytes
SHA-256: ab463cf7ae6d463a217c557a85cbbb72f09d08400e567af3e95f0eb51b9cc468
font_01_sfnt_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 10968 bytes
SHA-256: f0d3151030781bd06b52800a38d470b68d8f0f8b29409fabf2ff3dbeef0d6359

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