Malicious PDF — malware analysis report

Static analysis result for SHA-256 790d1660d3330a9b…

MALICIOUS

PDF

78.9 KB Created: 2021-04-25 14:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7d07770f46f8db6d62e854c3b257b616 SHA-1: 87ca788738526ee4e47c62d4e0775621a6620b8f SHA-256: 790d1660d3330a9b43a04fab7d57ae49e98ae1a12cfc81ba36857049a2e164e8
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 0.9994

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://bologen.ru/strik?utm_term=crossfit+games+athlete+training+schedule PDF link annotation
    • https://cdn.sqhk.co/dolitife/giiaaFV/banco_do_brasil_santos_dumont_fortaleza.pdfIn PDF document text
    • https://cdn.sqhk.co/buzodafevuj/7oidQhh/fly_racing_tour_roller_gear_bag.pdfIn PDF document text
    • https://bupogoduvokog.weebly.com/uploads/1/3/4/6/134690502/lomovusexosovunevix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404297/normal_6002d5036b026.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/i1hfkhi/vexed_crossword_clue_11_letters.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/nebuvadixe.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/wqhajfb/53701594591.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/awySlja/36542999489.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/3381353.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/dnLW8hf/snack._io_ranked_mode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417525/normal_5fe503b152ec0.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/WQZpjLT/card_collection_appraisal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5fdb184d27b5d.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/cdbghsV/12614470535.pdfIn PDF document text
    • https://norigawe.weebly.com/uploads/1/3/3/9/133988483/80359.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purufiz/bombay_dyeing_bedsheets_double_bed.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/new_york_times_crossword_puzzle_answers_-_nytcrosswordanswers.com.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_2e9a16fb684f4a4b9ea0616d19f22eb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/meludav/manual_denon_avr_1910_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/survival_sandbox_games_ps4_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/thank_you_very_much_indeed_answer.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_e347dee61f3b4e0e8b8432f670952ce7.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_c061766064a74a719f8dc35b07193702.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 5340 bytes
SHA-256: d3a2ca0df44a43a1d211b09539e09694b7bf5d5dc254e8368e65f3c28b2d18a0
font_01_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 10960 bytes
SHA-256: 1c489dbc8028c54fc955f5eaa1c05b3fbe0095c81df753b0669ad0d2b575ec76