Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f857be4f63d91a7…

MALICIOUS

PDF

80.0 KB Created: 2021-03-01 22:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 76073836003322e0fbcc56094a677049 SHA-1: 92d4ea44e05b658fb78009798855789efc69da9c SHA-256: 9f857be4f63d91a7baac19424782fbbbe409fc8c905df03b2decc32fd92f299d
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 0.9998

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://fokemale.ru/wix?keyword=midland+x+talker+t20x4+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378608/normal_60044cc32905d.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/dpmhigh/zumoxigitas.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/sibitegovex.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/bgCrKjc/free_to_play_tennis_courts_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_602984d71f7f2.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/j8Gjihh/batunugonabavojujo.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/ifow3ic/53586183479.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/2024807.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/hhNhjYp/savings_goals_ideas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370053/normal_5fca0f58843f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://takefaluzimun.rf.gd/casablanca_fans_intellitouch_manual.pdfIn PDF document text
    • http://wukusagabibumaz.rf.gd/10680512906.pdfIn PDF document text
    • http://kiwaxujunexozet.epizy.com/gufuvewil.pdfIn PDF document text
    • http://gisipusizen.rf.gd/sony_bluetooth_headset_sbh60_manual.pdfIn PDF document text
    • http://megisaduvivegi.epizy.com/how_much_does_it_cost_to_replace_a_pump_on_a_pressure_washer.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_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 5292 bytes
SHA-256: 3582943967d17d7c435d6e499eab90a2e4dde3a2123d163e39be5f9cffbdc942
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 15388 bytes
SHA-256: 5f7171b8d3d9f877f37d05b1130e55469c53a6088f628d991cd14eb73576df55