Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf0c8c4cebd17a7…

MALICIOUS

PDF

73.6 KB Created: 2021-02-16 11:55:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 51842bc03f407f97934ced7daf87f13a SHA-1: e2955b0d7250416185eedf13528114beb10a5955 SHA-256: ccf0c8c4cebd17a71a8383e95fe5862f7989779a1686d512af826f3ad5a1d638
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=08+honda+civic+service+manual PDF link annotation
    • http://sesulede.iblogger.org/dofatafaxopikowop.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/jjfhan7/40479938490.pdfIn PDF document text
    • http://edevletorg.com/characteristics_of_project_proposallkk0i.pdfIn PDF document text
    • https://cdn.sqhk.co/tarekekog/ejehd2g/bubble_bobble_2_nes_ebay.pdfIn PDF document text
    • http://zavudonalu.66ghz.com/lotuboxejefitevagobilol.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/h3jckhg/action_hero_actors.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/jfIhJjf/break_it_down_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/gcuiggd/22510080475.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/ce8hdu2/fresh_cod_recipes_healthy.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/LjfbVii/43756986479.pdfIn PDF document text
    • https://cdn.sqhk.co/nowagenika/dlgjhe4/ludo_star_for_windows_7_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafozubasopuji.rf.gd/articles_partitifs_exercices.pdfIn PDF document text
    • http://palipesokugukux.epizy.com/51364095448.pdfIn PDF document text
    • http://vuropomap.epizy.com/college_enrollment_verification_letter_template.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/viguxubedisovagu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 5480 bytes
SHA-256: 92d860c665860cb3459988a5e79dc7ddb794b8ce3fcaea311a504803f731cce1
font_01_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 10200 bytes
SHA-256: 23b905712885f065b410c6d56efb2a1627d8d30ddc6576810b3fc0bfb5608e89

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