Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f8354edbab7389…

MALICIOUS

PDF

88.1 KB Created: 2021-04-29 03:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9c93b242fff6847181e11a2679859b34 SHA-1: 51732d6a6b72c2e5ca1ca8e82aa5fa8be630af13 SHA-256: e7f8354edbab73893dfb7deada54f9a0df490d57bb3193b34e26a95bdb2aa939
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 0.9991

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://gimoguvi.ru/strik?utm_term=what+candy+canes+are+gluten+free PDF link annotation
    • https://wiwazojuxosupud.weebly.com/uploads/1/3/1/3/131379189/743c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464852/normal_6003c803b6732.pdfIn PDF document text
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/xapofesozib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_6068836278f04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404490/normal_5ff47c315c60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_605188e313722.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/modukudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375087/normal_5feb210f32bf6.pdfIn PDF document text
    • https://pinukavuzufov.weebly.com/uploads/1/3/4/3/134307945/zewix.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/86deab2f01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_60396ab0393e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_603146bd8059f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413005/normal_5fe124c3f232a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5fda73e32c68f.pdfIn PDF document text
    • https://visuriteja.weebly.com/uploads/1/3/5/3/135323353/6e0afd.pdfIn PDF document text
    • https://texotawumixiwaw.weebly.com/uploads/1/3/4/8/134898612/8d066bb46e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_e322bac1ce474423bb05faf533835362.pdf?index=trueIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_90ca88867a9d4a4c977c22fad638611e.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_5072c882eb6f49e4bbbc6ea4280348f4.pdf?index=trueIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_c4aea2ab577d48dc909a9a0cd485ae87.pdf?index=trueIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_bc25cfa1f1ab4eedb7b93f59c1c3b828.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_e77a8915510341c48ca2544b0299044d.pdf?index=trueIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_f0a0dd840786426ea630e5723b0a9519.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 5400 bytes
SHA-256: 7911407d06cb0f934076f801542e261e490ca4240490313e1c9688d7926231d5
font_01_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 10984 bytes
SHA-256: 76fe67ac939ea03e28ca99639d81193b921019b871359d16e29f621ad11586e5
font_02_sfnt_off00013e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E04 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90