Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdc9935615ef7de…

MALICIOUS

PDF

76.9 KB Created: 2021-04-04 07:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f348d66493c297e0fa420e6357fa9498 SHA-1: b7f951bbca1c3c9efb1d976be6656a0e7e6b33f7 SHA-256: 7cdc9935615ef7de80193ced1623ffd25ce01e5b876e527a1ba20667736c7db1
186 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, identified as a link farm, with many pointing to disposable hosting. The document body, though heavily obfuscated, appears to be a lure related to search terms, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=what+is+t1+11+plywood+siding PDF link annotation
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/d85a7.pdfIn PDF document text
    • http://motivawka.online/what_is_venture_team05lem.pdfIn PDF document text
    • http://zdsshop.top/dell_precision_m4700_laptop_release_dateg7jbn.pdfIn PDF document text
    • https://mifepomaxa.weebly.com/uploads/1/3/4/8/134897651/c8d09f19.pdfIn PDF document text
    • http://agencymedia-ig.com/deathclaw_egg_locations_fallout_76lbq0j.pdfIn PDF document text
    • https://powagaminabori.weebly.com/uploads/1/3/0/9/130969211/394b6ad82.pdfIn PDF document text
    • http://gufutaca3.xyz/gazufetu54q62.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/75313461c4cb68c.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/constituio_do_estado_de_alagoas_atualizada_2020.pdfIn PDF document text
    • http://amorexpo.com/real_bolt_action_awp_sniper_riflewrmkv.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/2215417.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/revuni.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/what_are_the_elements_of_a_valid_contract_in_real_estate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokosen.atwebpages.com/45873961558.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/dexipesimusesibugir.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/95172308875.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/troy_bilt_42_mower_deck_blades.pdfIn PDF document text
    • http://jowosos.myartsonline.com/birokerufenamawedixuveweg.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_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 5384 bytes
SHA-256: 9ae6944c8a392f8e98ce209af17e5cc14c0a29e0125ddc4be65f91ba2ee0f6a3
font_01_sfnt_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 11128 bytes
SHA-256: a5aa368b0df8567321d6df8282af2eec665c83a7e33b43a0c68b8f3a39c41e21

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