Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38f87b674708878…

MALICIOUS

PDF

77.8 KB Created: 2021-05-18 01:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e6ab4e2dacd933a141e19896286c806a SHA-1: 80c7f18eb50eed2fe1c78944152e89412c06b71d SHA-256: b38f87b674708878e96d9145caef7800505b40f945fdb8f1581569ee12f62c05
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=how+to+estimate+your+dog%2527s+size PDF link annotation
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/3093351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_601ef08e94cd3.pdfIn PDF document text
    • http://kivumokaf.22web.org/duriworonexerokipezeziraz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_6065b2b495ba1.pdfIn PDF document text
    • https://fotapudugibinok.weebly.com/uploads/1/3/4/8/134899903/bafujediwixaxedinuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_6054c9a0b1c17.pdfIn PDF document text
    • http://gijipodotetojo.22web.org/fijejofovolig.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/selutoru.pdfIn PDF document text
    • http://febefapowe.22web.org/rewuvuwesazasasasisatev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5ff4dcb480e16.pdfIn PDF document text
    • http://dumovabitoda.22web.org/vulazamegisi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://raxusitusumulag.rf.gd/laboratory_equipment_and_their_uses_with_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad0e1c3-4b5b-48e2-b881-5bd2a1f76d4b/nietzsche_philosopher_psychologist_antichrist_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33266dae-8541-4227-b935-65d7f03a8f9f/how_many_calories_in_arbys_double_roast_beef_sandwich.pdfIn PDF document text
    • http://bofogaf.rf.gd/riwuzidov.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/69222770457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e23f144-f66b-4723-a155-29f6a7ca0257/88960444273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d8e31c-0c93-4602-b068-515a1f4386cc/scotts_riding_lawn_mower_deck_belt.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/kaduninubagolazokenuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/58232921483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f68250-9301-45b5-9a06-30c5f0601499/59378802704.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_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 5352 bytes
SHA-256: df027377085093deccd660ba74301e3975ca576d2476a1ffb665a2fc8df16262
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 10564 bytes
SHA-256: 7371ee160d613f3a17ef211a021b42993f22627a9d31f892e7678cd5b0f63dd7