Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b67b66f1e5a1573…

MALICIOUS

PDF

84.5 KB Created: 2021-03-10 22:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e70e0d25305e687befd386b778efacee SHA-1: b6c50049808f7cd6dd1cb8104f58436196df5e62 SHA-256: 7b67b66f1e5a157321a8fa4d83072afc6e753c7aeb94a0d6a9764ba38eb9e38a
244 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous links to external websites. Several of these links point to known malicious redirector infrastructure or disposable hosting, suggesting a phishing or SEO spam campaign. No scripts were extracted, but the presence of many embedded URLs indicates a likely attempt to lure users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=strength+exercises+for+runners+pdf In PDF document text
    • http://rigudozefogo.mypressonline.com/jevamizamokesak.pdfIn PDF document text
    • http://leledup.mypressonline.com/kenwood_ddx470_wiring_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_603238ba47c60.pdfIn PDF document text
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/3485486.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451754/normal_5ff4da0c0b057.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/hc9gijd/moncash_loan_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5fd0a16b6d898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fe733fdf3ef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_603efe01e95fb.pdfIn PDF document text
    • http://zufegusidego.iblogger.org/email_marketing_platform_companies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481162/normal_602a7dec25edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_6026b8ba21897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407747/normal_5ffff6b715bfb.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/fvhgMjg/vubepel.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/1f5861a60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixigor.onlinewebshop.net/wujeraguwopobogoxonodi.pdfIn PDF document text
    • http://lidesesepaz.rf.gd/eleuthera_restaurants_guide.pdfIn PDF document text
    • http://wenares.myartsonline.com/counterbalance_forklift_training_near_me.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/70319062162.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 5344 bytes
SHA-256: 0d070914ba1a95e02344597f92b3319ed02a24ef42aefba93196ead010fbe4ac
font_01_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 10576 bytes
SHA-256: 26d4d681d339ffd0211aaceb01d653fe2877b5ce122ebd5f593586cd1d951d3f