Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75606f1c347cb3c…

MALICIOUS

PDF

73.8 KB Created: 2021-05-23 15:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97db1a927dea661bfbad57d7c7046676 SHA-1: 8291bea3066306dd13f14d131ae8de060f06447f SHA-256: c75606f1c347cb3c9dce36d6dfb9e5267b96d09612da49970105e4000297a2d1
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Android default video storage location', likely a lure to attract clicks to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=android+default+video+storage+location
    • https://zigudufojivop.weebly.com/uploads/1/3/4/7/134718002/8280651.pdf
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/1524509.pdf
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5fc6dd2a58986.pdf
    • https://salobejutar.weebly.com/uploads/1/3/4/5/134589592/jobatunubur.pdf
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/2958277.pdf
    • https://xanowiporak.weebly.com/uploads/1/3/0/8/130814060/jalilumo.pdf
    • https://mufawazaxomet.weebly.com/uploads/1/3/4/7/134764665/5853900.pdf
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5ff32a1af1815.pdf
    • https://static.s123-cdn-static.com/uploads/4375357/normal_5fdd3cfeed7b2.pdf
    • https://mepuralomelefaz.weebly.com/uploads/1/3/4/4/134494325/zetiz.pdf
    • https://cdn-cms.f-static.net/uploads/4480899/normal_601b435abec62.pdf
    • https://cdn-cms.f-static.net/uploads/4464996/normal_604ba7ee5d26e.pdf
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/8984a82ffceca43.pdf
    • https://tefuledajejus.weebly.com/uploads/1/3/1/4/131437322/13a497c652e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8b573e55-dc81-4b42-9b10-ff5a122b9aa9/rejokovudifefofavusufujod.pdf
    • https://s3.amazonaws.com/sizadagazagaj/9630458828.pdf
    • https://uploads.strikinglycdn.com/files/b468a889-c6ef-48c6-8061-68780c6cb256/maximum_principal_stress_theory.pdf
    • https://uploads.strikinglycdn.com/files/c5e38381-4b60-4e5a-9cdf-ddbb985e75a0/elkay_water_fountain_service_manual.pdf
    • https://s3.amazonaws.com/wonumafubij/zetabujivina.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_off0000e47d.bin
9f61da93e7f1dc7315ddd118fbf47148eab621b98e9aeb044ed4aa756dfdc701		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 5236 bytes
font_01_sfnt_off0000f669.bin
bac5f643bab08cd0b6af5c5be343d820e5e35ad865095ea66f362c0b2d7646cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 10436 bytes

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