Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad79cc54759a9445…

MALICIOUS

PDF

88.6 KB Created: 2021-04-09 02:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba7cbc0ff7b6b4414fb50f1bc0aebe96 SHA-1: d0b5036e6cfbef2b63dc51669230e4de32ce70f3 SHA-256: ad79cc54759a94452a2dd170b06c348c32c36f5dc55f3266a7187b299e40ec9e
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 0.9996

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://dugedepap.ru/strik?utm_term=company+of+heroes+movie+imdb PDF link annotation
    • https://cdn.sqhk.co/wajidafix/bfhghgh/kefexepawi.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/gdjjKid/marketing_strategies_examples_for_business.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/v8hdjeg/kefewoxaralolikotaro.pdfIn PDF document text
    • http://repair-telefonov.ru/bright_memory_game_for_androidw4bur.pdfIn PDF document text
    • http://remont-kholodilnikov.website/pulejebibapemujonimin06hk.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/ravumimerasutires.pdfIn PDF document text
    • https://cdn.sqhk.co/badilapo/YFdDjiG/sapajexuw.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/cigrSic/cake_games_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jufulezamuko/jfjbiht/zanumunuwizebawu.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/piejiie/68162585589.pdfIn PDF document text
    • http://connexion-amelii.xyz/poguvilun9jtch.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/jhUCIuE/mage_defense_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/ibhghhL/ludixesufomaxidubuvososex.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/futeg.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/hjjbKjg/dosamikirugaxategedupuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekelaxowe.atwebpages.com/79480797781.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/gobebiwerunezugoreginot.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/harlands_primary_school_ofsted_report.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_b91b1b2a3fbf41fdb33328e019e77467.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_544610d69af241ca92aa3aa6bb09ff97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/71636304972.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_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 6212 bytes
SHA-256: a7dc8a55871287dfd8dc4faa941d1fcdc6df20dd016ed801901e78f9042850ae
font_01_sfnt_off00011894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 5456 bytes
SHA-256: b0637bb6028634e6dba99c8cd27c6435c00af0e853710546bfa8bae8c8cc1903
font_02_sfnt_off00012afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 12568 bytes
SHA-256: 2d53213a7cf15cde06eacd427085d2750fe9a8fd5e0db22ab45646fc449039e5

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