Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18ca7822772fcd6…

MALICIOUS

PDF

81.0 KB Created: 2021-04-12 09:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 521e1432385530e4e6459221e77b4213 SHA-1: 108514b4473ef2abce930127079ea4d971003d9a SHA-256: d18ca7822772fcd60c0ec31fa533687cfd3030df4e7ec7561bb359501d692137
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • 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://vilenefex.ru/strik?utm_term=how+to+set+up+a+harmony+700+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419832/normal_60196ab5606ea.pdfIn PDF document text
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/regubogewevapof.pdfIn PDF document text
    • https://kizevopizimi.weebly.com/uploads/1/3/5/3/135351298/gojevomi.pdfIn PDF document text
    • https://xiligori.weebly.com/uploads/1/3/1/4/131411896/773b298f965b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_605ccc0f728ff.pdfIn PDF document text
    • https://wipaluxeko.weebly.com/uploads/1/3/4/3/134346688/c6dac0e24.pdfIn PDF document text
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/zonisigumisuj.pdfIn PDF document text
    • http://jewlgems.com/final_fantasy_tactics_war_of_the_lions_job_skill_listu3rku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465397/normal_5fe50be89558f.pdfIn PDF document text
    • http://ergors.space/mafivvtvtj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fccb385e6431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_600dc769cd891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_6065a1a5986fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470964/normal_605c17593178e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454432/normal_5fddc6caf1398.pdfIn PDF document text
    • http://bilabugova.iblogger.org/authorization_to_release_information_hipaa.pdfIn PDF document text
    • http://resimpub.com/characteristics_of_fascismca0i5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_5cd7319580934b18a0b8fce337e2a46b.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_a771152151ce423783859b8d6bb614d2.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_129839cf5b3846a4875c647cc6be2b4c.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_21d668d21ec24c8fb413b3b32117474a.pdf?index=trueIn PDF document text
    • http://bezofiwod.rf.gd/sabotixesekadanu.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 5404 bytes
SHA-256: 8231444a6b6cbabec935d1d964208bd1c84678c52075061940aee8d1db4ddbf6
font_01_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 11052 bytes
SHA-256: 4ecbd7f527d23404f8bfbd9e50b0221fa64e49c22c25237f504aefbd449a6f3d

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