Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cbb0454faa9626…

MALICIOUS

PDF

87.7 KB Created: 2021-05-01 11:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b99a44cce666509c7b08f707bb148a30 SHA-1: 5273b658427b18146603122731a38cdb5127d3d6 SHA-256: a2cbb0454faa9626977a5f2b1b9b62e033c2bf866bfd63547246dab4c265a41f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, https://vilenefex.ru/strik?utm_term=samsung+55+inch+curved+tv+series+6+price, appears to be part of a campaign to lure users with deceptive content. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

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://vilenefex.ru/strik?utm_term=samsung+55+inch+curved+tv+series+6+price PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403817/normal_606498d5beb84.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/analytical_groundwater_mechanics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_601a120bc8e55.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/financial_risk_management_journal.pdfIn PDF document text
    • http://raifaisentgo.online/xofubigikegusimugarepezamrmb8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426572/normal_6069e6fd1154c.pdfIn PDF document text
    • http://stalekost.site/794396585501hd5d.pdfIn PDF document text
    • http://nixekagog.22web.org/drishti_environment_and_ecology_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nujilexulajuwup.atwebpages.com/3586913483.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_eb80ef465e3b451e9a26adce2648ce8f.pdf?index=trueIn PDF document text
    • http://duposavolat.rf.gd/anonytun_apk_pro.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_bdbcae02738c4af9b00d5486fdc529f5.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_5b692bfc358240b6a491acde5c842b67.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_c040e9a6a4cc43eabb23025c83a339dd.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_29a50afcaa014eb8ba8acd4176647361.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_f02094324a2a475b9948e41ee41db60b.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_b149eb2eb04c48ca9afc6fb058775a41.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_d8cf1d3a4e914f64a5b8429f16dd676d.pdf?index=trueIn PDF document text
    • http://nifusotajezunur.atwebpages.com/que_es_el_manifiesto_comunista_resumen.pdfIn PDF document text
    • http://pasejisozud.rf.gd/49428335738.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
    • 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_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 5896 bytes
SHA-256: 8ef039533a68a7d78729a4ebf4e3af593421b3ad0eae5b2b614d4d9def213080
font_01_sfnt_off00011535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 11300 bytes
SHA-256: 6135ccb7789dbafef2c82bf97b531b65f30164595e8258e1b0d1d398a101ef90
font_02_sfnt_off00013bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF1 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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