Malicious PDF — malware analysis report

Static analysis result for SHA-256 40485b22ee790b58…

MALICIOUS

PDF

71.0 KB Created: 2021-02-06 01:39:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 062425d541117106443b160d1c84c707 SHA-1: c1dfb6804cf660cef55131329e7163d90aaf8634 SHA-256: 40485b22ee790b5887d7342fb712cedd00475eb34651de05e8de742c8accd9cd
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to search terms, further supporting the lure-based attack pattern.

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.
  • 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://baarspo.ru/wb?keyword=e%20c%20m%20ka%20full%20form PDF link annotation
    • https://cdn.sqhk.co/kunimanujage/gdhcQge/zidepivexirirepositowag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494433/normal_5fe76ed6403f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_5fe785126f9ca.pdfIn PDF document text
    • https://kuwuvolabakeg.weebly.com/uploads/1/3/1/4/131407812/8d78f0.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/hiXOx5u/platform_panic_all_characters_and_upgrades.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/6JABjd1/production_sound_mixer_assistant_job_description.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5fefefaebb637.pdfIn PDF document text
    • http://naturfresh.space/dovenonaxutebakataje9k1n6.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/ac55408ce3ce.pdfIn PDF document text
    • http://lorenbayi.com/aroma_arc-_363ng_rice_cooker_manual7dmn3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370053/normal_5fe1973ccc45d.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/YPigKoD/42283386035.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/FOWhdhd/word_jam_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/paweboke/7hcieji/best_buy_ninja_air_fryer_xl.pdfIn PDF document text
    • https://sojofiveku.weebly.com/uploads/1/3/1/6/131637763/a4797b064a64e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_600c276926960.pdfIn PDF document text
    • https://nutakiderovex.weebly.com/uploads/1/3/4/6/134622867/c317cf77232b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 4868 bytes
SHA-256: f7df942986cc65bf3713cfec3dfdf2afe5a250d4726da7038a9da4f203d78ba7
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 11176 bytes
SHA-256: 28b74b630b2124f71879c9bb74ec2e50ecad21cae236f23c9eb347baf349998f

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