Malicious PDF — malware analysis report

Static analysis result for SHA-256 427d39c0483bc0c5…

MALICIOUS

PDF

79.4 KB Created: 2021-03-14 17:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58e95f9a5d5691802812d1566800587a SHA-1: 68b9b093d3ff7ffc1a853948ec9f70a4af3d0009 SHA-256: 427d39c0483bc0c543a471cd3000d0c6b49158a92fab196a73e2f28a485e6a70
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 an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body is heavily obfuscated, but the presence of numerous external links indicates an attempt to redirect users to potentially malicious content. No scripts were extracted, but the overall structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=molecules+of+emotion+summary
    • https://cdn-cms.f-static.net/uploads/4470837/normal_6021f74b513ca.pdf
    • http://maykistore.ru/687264430v5njm.pdf
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5ff27295124d9.pdf
    • http://sevoxotedeki.medianewsonline.com/bis_711.pdf
    • https://cdn-cms.f-static.net/uploads/4384640/normal_6011edb33fb6a.pdf
    • https://cdn.sqhk.co/fegojujor/fzhPYZ1/54657832099.pdf
    • https://cdn.sqhk.co/kososojog/mZKdDPV/95636586618.pdf
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/147476.pdf
    • https://static.s123-cdn-static.com/uploads/4478655/normal_600281f1d20f4.pdf
    • https://cdn.sqhk.co/zuxafopagad/HEvighf/applock_app_download_for_jio_phone.pdf
    • https://losuwigawoje.weebly.com/uploads/1/3/5/3/135304717/dd33af8f12c24.pdf
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/0e9b944e00.pdf
    • http://goladelexugezi.sportsontheweb.net/29359209181.pdf
    • https://cdn.sqhk.co/lunilageruvu/hUHokTU/hearts_of_iron_4_mods_not_working.pdf
    • http://top-agent.ru/animales_nocturnos_pelicula_completa_en_espaol_latinoyf03b.pdf
    • https://ponadolofulofuk.weebly.com/uploads/1/3/1/3/131398561/3620615.pdf
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/5508771.pdf
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5fc87e38ae826.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_22cffde09e0e4cbeaa666d5b0dc27b7f.pdf?index=true
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_556dd36f0fa0461c8e930698189daf49.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_c5770b1427e447df89d5b4738351a726.pdf?index=true
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_e46b93a43ef9403eb86fddce63878849.pdf?index=true
    • 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_off0000f905.bin
d59a7f37ee2718ff50773d29df729aacb0f969810f985a5e12fe2cf8b8f369be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 5136 bytes
font_01_sfnt_off00010a78.bin
ed730a0848d1e1dd4c8d98d042683fbb17f658c3214d71d8b17fba8c952b33e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 11068 bytes

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