Malicious PDF — malware analysis report

Static analysis result for SHA-256 f494ac624951f1f5…

MALICIOUS

PDF

75.5 KB Created: 2021-05-04 17:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 90371e0605e67230cc323998cfda4c4d SHA-1: b1f07d7d6335e35d41200abb73820524b5926be8 SHA-256: f494ac624951f1f5218bca2685461f125a137e0231782eb012ecf85108768719
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=frigidaire+gallery+refrigerator+repair+manual PDF link annotation
    • http://profer-opt.ru/970467751891r2mz.pdfIn PDF document text
    • https://mipedurekarano.weebly.com/uploads/1/3/5/3/135321071/734d337.pdfIn PDF document text
    • https://zegaxazidunuxe.weebly.com/uploads/1/3/4/7/134746987/ffba3fee5.pdfIn PDF document text
    • http://thefortykuti.com/mokijasavepemudijikajhjec.pdfIn PDF document text
    • http://telgrm.site/what_are_the_cmyk_values_for_yellowba365.pdfIn PDF document text
    • https://bimefitovaj.weebly.com/uploads/1/3/1/4/131437299/4962957.pdfIn PDF document text
    • http://edevletorg.com/kimimonemegife1w9wf.pdfIn PDF document text
    • http://znakomstva69.space/childhoods_end_pink_floyd_lyricspws8o.pdfIn PDF document text
    • http://itnegozio.info/772163598833r3o2.pdfIn PDF document text
    • http://ch-redirect.icu/android_game_emulator_apporqdb.pdfIn PDF document text
    • http://vzroslyh.net/gibogoruzanovekakixisepuigqns.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://23fe9111-5aa3-4288-b7a4-a84c242bb647.filesusr.com/ugd/d35b85_6fd68eecc4804cef9a2e8a6e1dba3716.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_12b8ba03cec9470f9a68f2cc174611e7.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_597d11e9146c4a91a246f4b77cf81618.pdf?index=trueIn PDF document text
    • http://betozet.rf.gd/python_code_examples.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_217fd5a9ad484b74bb80634411cec536.pdf?index=trueIn PDF document text
    • http://tilixufevoj.epizy.com/marketing_cv_template_free.pdfIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_c5f5af3c60274c07b4a3f28b2d654247.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 5240 bytes
SHA-256: 0ad167d2e324e141a5f348fdff56ae9b66b2971f560be4f817db0a18267bbe3a
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 10772 bytes
SHA-256: f0314da6397a962a76dfcdf87b89369c04a80a2fdbd796313476b9392669e520

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