Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc898681bfdce02…

MALICIOUS

PDF

79.0 KB Created: 2021-03-18 00:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c3cdf62452c94ef8c77a4f12b54c99f0 SHA-1: 55d974a44b35a538a30b7954195e39511563e146 SHA-256: afc898681bfdce022f6d307a0aab5b06a012a16acafebac1aa36871a7924d936
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/wix?keyword=kung+fu+panda+2+full+movie+dailymotion+part+2 PDF link annotation
    • http://gratoraama.website/what_is_meaning_of_the_word_liminalenzvp.pdfIn PDF document text
    • https://fizemovumevomuf.weebly.com/uploads/1/3/4/4/134491325/fb4c14daae67.pdfIn PDF document text
    • https://kosazalosir.weebly.com/uploads/1/3/2/8/132815054/fcf5f93b10f.pdfIn PDF document text
    • https://sugemisikuwev.weebly.com/uploads/1/3/1/8/131856456/4500430.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/lixegibirugegi.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/rorikikiwefatisukexa.pdfIn PDF document text
    • http://bobixuposu.22web.org/43678233999.pdfIn PDF document text
    • https://muzuwetabez.weebly.com/uploads/1/3/1/4/131483468/jexijewidivexunir.pdfIn PDF document text
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/rulufefikegiwaz.pdfIn PDF document text
    • http://top-agent.ru/mokamemisisipl0t54.pdfIn PDF document text
    • http://helpcreditscore.info/593440774356njo2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufizufidubak.rf.gd/fire_burning_sound_effects_free.pdfIn PDF document text
    • http://lukovim.epizy.com/osha_injury_reporting_guidelines.pdfIn PDF document text
    • http://dimegebewode.epizy.com/central_pneumatic_3_gallon_air_compressor_regulator.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_5b6069daa8fd4e5697b9981b4aa6010d.pdf?index=trueIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_dfd72af941ec454d8b77c26c70e0e153.pdf?index=trueIn PDF document text
    • http://vefolex.rf.gd/project_acceptance_letter_format.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_63f09d2f18dd448ebc252bc589b6c111.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 4532 bytes
SHA-256: dc0f9e5098166736cd4435cfc112de036f89b0ad897667dd4c843a76fa4973dc
font_01_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 5444 bytes
SHA-256: a70db837abc3e2161cab2d1931ac8ff556b2b1348e786d70e95f0c1023f8b057
font_02_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 10832 bytes
SHA-256: 9bb5edca86be95e28cd3caa40e566a00887e8380380916d01971c5454a9cce10

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