Malicious PDF — malware analysis report

Static analysis result for SHA-256 883c5d5bed680bff…

MALICIOUS

PDF

72.3 KB Created: 2021-04-27 22:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77625a06d84887b860186a3935a1e6aa SHA-1: c438beca6617e7c72e3c3b873f37277219a9c85a SHA-256: 883c5d5bed680bfffaa017ba6345dd4c11132165b763b84c008fe571ec49fa86
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains and redirectors, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=janome+new+home+sewing+machine+parts
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/sujuderizasunifopu.pdf
    • https://sibovobum.weebly.com/uploads/1/3/4/8/134879451/fupositisusunik.pdf
    • http://ganedoxumizaj.sportsontheweb.net/ectomorph_bulking_workout.pdf
    • http://tapasin.sportsontheweb.net/mamawejobipexiwed.pdf
    • https://static.s123-cdn-static.com/uploads/4379234/normal_5fde903d09ddd.pdf
    • http://vataponuxizeliz.mywebcommunity.org/acls_new_guidelines_2020.pdf
    • http://telovajov.medianewsonline.com/acceleration_problems.pdf
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/934668.pdf
    • https://kobadoxe.weebly.com/uploads/1/3/4/3/134310171/peruxazibe.pdf
    • https://static.s123-cdn-static.com/uploads/4413867/normal_5fe506bec2fae.pdf
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/9376856.pdf
    • https://cdn-cms.f-static.net/uploads/4365602/normal_602c40c0bd179.pdf
    • https://tebebutak.weebly.com/uploads/1/3/4/7/134744698/7cc6c4645ae24af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_6f9fc50cc800460698d6a56c90fc720a.pdf?index=true
    • http://lugimeviguv.myartsonline.com/lepebixazilud.pdf
    • https://s3.amazonaws.com/fosawef/padazapovowolupibunasod.pdf
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_e8af51a64e324a498243ce60b1146e38.pdf?index=true
    • https://s3.amazonaws.com/gagagakigibapo/79695747327.pdf
    • https://s3.amazonaws.com/mamibis/ribokunefutodozu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8c.bin
162daa1b07b9fbedce9296e572f24a2cb0ffdf998116e35f2806c669c924539e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 5396 bytes
font_01_sfnt_off0000efd3.bin
df8e7a1bb169e53b351949cf1802c016ef1f119b25c17424ec5baca5a4591118		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 10156 bytes

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