Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1b9922a6c031b7…

MALICIOUS

PDF

77.2 KB Created: 2021-01-08 02:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 90a985a0b9d5e48aa86215ea7b6deaee SHA-1: eef3e5cbb34842dcb3900f060c472a95968fbdb8 SHA-256: 9b1b9922a6c031b731530a7091a5e7f88dab91fdf2647cb2026f470794a093fe
254 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links that redirect to malicious infrastructure, specifically identified as a phishing lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate that the document is part of a link farm designed to distribute malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/123?utm_term=estructuras+de+lewis+ejercicios+pdf In PDF document text
    • https://gonibulurigudum.weebly.com/uploads/1/3/0/8/130874364/3851392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471985/normal_5fe4e28d67aec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f890a87398a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_5fa0d6ccad611.pdfIn PDF document text
    • https://jiwanozote.weebly.com/uploads/1/3/4/3/134354006/mujopetowob.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/idHdSgf/call_detector_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_5fbc241925825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469852/normal_5fde82e5201f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/18015355460.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/32081550159.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/kogiwubijemivalezomajakik.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/architecture_microservices.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_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 5052 bytes
SHA-256: 1b663e71d019df425204d39cec3084abf0c3e7867a1162a742a88d2ffbdd825f
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 11420 bytes
SHA-256: 0c2556e87a9fb04c32d6852b639c59ac86e9167d107cd46ad98f3a8708843896
font_02_sfnt_off000117b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361