Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dea23aa8bdc061…

MALICIOUS

PDF

79.2 KB Created: 2021-03-23 21:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1a9345e97ef7688464551a3da3b83609 SHA-1: ef5e3e16881d7660bfda775a3636ff1f90a41c84 SHA-256: 22dea23aa8bdc061c4085a14609e9b156315ad09427fbb2fcf0602e45ddfe84d
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary URL suggests a phishing or scam attempt related to internet service provider routers. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=can+i+use+my+fios+router+with+optimum PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458849/normal_605a13cf12c6b.pdfIn PDF document text
    • http://indonesia2health.online/catan_universe_login_problemsz1t90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_601907ba99d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_602c009584ffe.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/qibgchc/vijapafolur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_603c0e66d0f77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381297/normal_5fcca0e92315c.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/HMiefQ1/imf_grant_program_2020.pdfIn PDF document text
    • http://artyom.guru/wonigatedivtpyq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426813/normal_60058182e6b28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369508/normal_5ff557f22b7e5.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/Oicihhe/4605058245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/dexoraw.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/android_uninstall_app_adb_command.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_45c15c30fb004543a4e1bb7311d8ef5b.pdf?index=trueIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_3ceecdf4df954eb3bc72f0bf098d0e59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kofabube/evaluatepharma_orphan_drug_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/fmla_calendar_template.pdfIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_0ae89b951b374792994c125f9de6de82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabisura/livuxodeke.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_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 5208 bytes
SHA-256: 457331de6fdb043059e884e210bfadea7fed3fe927bf6a69fc958c415187eae5
font_01_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 11056 bytes
SHA-256: cedb37ae880e9d89c15abff0d76938a246c87e8e61f920df2ccb2c837aef5f62

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