Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccdf0146dd99075…

MALICIOUS

PDF

82.2 KB Created: 2021-04-04 21:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32db631a7c21198213eaa5f83c19c268 SHA-1: 1c5fcc2b1db578b4062a449f5de22e647d6a3cd7 SHA-256: eccdf0146dd99075f849761f46988bb2e042d6ce9b14ccacf9d2159588748485
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farms or phishing campaigns. The primary function appears to be directing users to external resources rather than containing malicious code directly within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/123?utm_term=abdomen+agudo+pdf+clasificacion
    • https://dabemevabun.weebly.com/uploads/1/3/4/4/134476179/2e83ed42.pdf
    • https://cdn-cms.f-static.net/uploads/4388596/normal_602a7c5027128.pdf
    • https://jepunitapo.weebly.com/uploads/1/3/1/0/131070437/fimiduvezawavu_tazaxibes_fitikolo.pdf
    • https://cdn.sqhk.co/nemanive/vExge09/92217721408.pdf
    • http://nulivanofika.mygamesonline.org/jumeviduxikori.pdf
    • https://cdn-cms.f-static.net/uploads/4461746/normal_6013bf2b3380f.pdf
    • http://buxodubofazaki.iblogger.org/95903153806.pdf
    • https://cdn.sqhk.co/supetudoti/hjgijij/83605815321.pdf
    • https://cdn.sqhk.co/fekawifen/jhvYcad/jozitidala.pdf
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/206ba7f29f82377.pdf
    • http://kanaxade.mygamesonline.org/tigavezisatiti.pdf
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/rupikenumejarabif.pdf
    • https://cdn.sqhk.co/jasurisunav/igftOic/modern_digital_marketing_techniques.pdf
    • http://woperevolowe.22web.org/47019597539.pdf
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/wijenebopedepif.pdf
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fffd2ee0dd56.pdf
    • https://cdn-cms.f-static.net/uploads/4426953/normal_6044f9647e1cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_9b36bc094df240749b89c3b474038143.pdf?index=true
    • http://wufagezigedo.onlinewebshop.net/97130444930.pdf
    • http://walefusariwe.epizy.com/voxewigovoviburiwiv.pdf
    • http://kiwuvapinemugi.rf.gd/imperative_form_worksheet.pdf
    • http://dogiwexor.myartsonline.com/zujesesasexoxogobixap.pdf
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_f9532735adcf4c22b852eb5f0bd31197.pdf?index=true
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_2dd67026b57f43fb95d83078c889be71.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_off000101f6.bin
626ae1fa50dd4e0eb12486b03036a2c3a010e267e078ffff23cd15d885d69236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 5508 bytes
font_01_sfnt_off0001149f.bin
f92028bdb2ed1a1de887cdaa2f5f7e5fcab63bc12e8f8de6e79d270785731567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 11572 bytes

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