Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c41215cf7d7095…

MALICIOUS

PDF

73.3 KB Created: 2021-03-28 18:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 77d4cd804bf50fefa657b73e83099c64 SHA-1: e45cba549b3a02e1c802529b70f2fd8c4b626a81 SHA-256: a7c41215cf7d70950ef06fec943210f22dec47d4e70cd8bca03133ec9d12555b
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/123?utm_term=what+are+cosy+house+sheets+made+of PDF link annotation
    • https://razebefalokugex.weebly.com/uploads/1/3/4/8/134895215/pabexa_damukokikuv_nateraba_zomov.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/fjeijgj/galaxy_attack_alien_shooter_pvp_tips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_603f54eb882e9.pdfIn PDF document text
    • http://nanutoz.22web.org/sabezom.pdfIn PDF document text
    • http://kexopef.iblogger.org/wijal.pdfIn PDF document text
    • http://cetakchantek.com/maigret_in_montmartre_cast93eyc.pdfIn PDF document text
    • http://fbdirect.site/intermediate_financial_accounting38jj3.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/vixewotifi.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/jePw4ib/65301004174.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/die9gdr/worlds_hardest_game_2020.pdfIn PDF document text
    • http://ijmalan.xyz/39195269998ab41v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444643/normal_5fe41bb86b2cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_8bde860a71684b168031cefd15ffcc83.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_398e0a4936014774906d1e27107faece.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_0e5bdea4e2244773be8513266e455108.pdf?index=trueIn PDF document text
    • http://nirobow.epizy.com/nokiwewanuge.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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 5344 bytes
SHA-256: 266c0b672827aae64dc2d8d28b46bb9a80c30196be1a960003ab8f956412d58f
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 10792 bytes
SHA-256: ebd16bd7dfff36db2989029b2d74fb004ba37801b135856c88ff38ce980c4d9c

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