Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5f52c59d2b6359…

MALICIOUS

PDF

74.2 KB Created: 2021-03-29 00:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b74fc1f0b3c49d410640c5c5a05bbc33 SHA-1: c887164906a270d3315e3c7a9343ab92b261e910 SHA-256: ea5f52c59d2b6359e5bc68f5561817048c3ebd9261b2d65c2cb8c72f22e2edaf
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a prominent heuristic indicating a link farm and an SEO redirector pointing to 'https://vilenefex.ru/wix?keyword=what+is+hastak+in+kathak'. This URL is likely used to host phishing content or distribute further malware. The ML classifier and ClamAV detection strongly support a malicious classification. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=what+is+hastak+in+kathak PDF link annotation
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/gekofojodefiwoxipat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460725/normal_5fcbd69f8a144.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/garmin_nuvi_2595lmt_sd_card.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/fovamuwep-tavorirunikuz-puvex-jenadapul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502188/normal_60043f0663a17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_6020f91c3496f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_606020e32ac65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/doxifuba/90618667377.pdfIn PDF document text
    • https://9505ca4c-dfdc-4941-8fde-ded35496d0c9.filesusr.com/ugd/2097ab_c7a061fbe8d94dc6b549175c1398fdab.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_b7a1dd056c4e4ef386a86895242e9194.pdf?index=trueIn PDF document text
    • http://zedizokasub.rf.gd/around_the_world_in_80_days_movie_worksheets.pdfIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/tanupemakatir.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/fubone.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/xaxudujasogatem.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/mubenizejamegubi.pdfIn PDF document text
    • http://kosoluzenoderu.epizy.com/asbab_al_nuzul_by_al_wahidi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 4284 bytes
SHA-256: c3dc4afcd68cee9c6cf9ec0e893a27e10f0ae1313276251c7b11957925bd37d5
font_01_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 10460 bytes
SHA-256: 98204fc69abb0e94da431055cfbf642847c89510f27b91188b14a04d465d3f5a
font_02_sfnt_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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