Malicious PDF — malware analysis report

Static analysis result for SHA-256 4000d59c4192692f…

MALICIOUS

PDF

66.0 KB Created: 2021-02-20 18:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8d17747c001d8a51cf4b0860b573c67e SHA-1: e66e69151c628ddc6ce35a87ac040a9f9935f5b0 SHA-256: 4000d59c4192692fd09a900635e9e95d6c116258782867b054c0d53a89fa07dd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with several pointing to disposable hosting and potentially malicious domains, suggesting a link farm or phishing lure. The document body, though partially obfuscated, mentions 'How to set tissot 1853 watch', likely a pretext to drive traffic to these external sites.

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/strik?utm_term=how+to+set+tissot+1853+watch PDF link annotation
    • http://lobarularexe.iblogger.org/78976645408.pdfIn PDF document text
    • https://lilugotowo.weebly.com/uploads/1/3/2/7/132711957/5d401c20a707040.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/jhcmjb8/14118903129.pdfIn PDF document text
    • http://reduslimitalia.site/funny_movies_guys_likewyayu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_602b5dc730095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499984/normal_60245f73aa0a9.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/f78452eae.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/igjG8uF/56893644520.pdfIn PDF document text
    • http://brightshopbg.xyz/ayesha_omar_songsfeq9s.pdfIn PDF document text
    • http://avit0.cc/best_goal_goal_predictions_today4fg8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366305/normal_5fcecc9700791.pdfIn PDF document text
    • http://selizixid.iblogger.org/zuvusetidinowol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mogedozara/burorosojon.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/apprendre_l_anglais_rapidement_et_efficacement.pdfIn PDF document text
    • http://lumajenav.epizy.com/36223598489.pdfIn PDF document text
    • http://sivigowukom.epizy.com/official_receipt_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/fifiwoxivamisetozinani.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D6 5344 bytes
SHA-256: 0b7c6b91520f42b9bdd147e2fd71bc03fa415b49038e45541922aab753d98e7d
font_01_sfnt_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 10288 bytes
SHA-256: 1ac6dac73d3b56591cbed234e54f1446b21e3fc06a23211a8e70ea9ced0d8ea5

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