Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ec82de66cf4506…

MALICIOUS

PDF

72.8 KB Created: 2020-12-23 16:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 518cbce9ac42e80935f44deb06c51ba7 SHA-1: 8a502efe247d8037dc3a093ff1f36f8649584e58 SHA-256: c3ec82de66cf45069ba209d8d9b07fa54637a3eec9bee21c988005861b1c6822
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

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.
  • 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://gettraff.ru/aws?utm_term=astrology+answers+scorpio+2018 In PDF document text
    • https://cdn.sqhk.co/situdejoj/37jdChi/puffin_web_browser_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/nezafomura/RDnG35s/f_stop_gallery_pro_paid_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/whiahgk/gekagezizuguxurot.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/2139371.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/xixegugas.pdfIn PDF document text
    • https://liziruji.weebly.com/uploads/1/3/4/3/134380663/7c997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417145/normal_5fce82f53402d.pdfIn PDF document text
    • https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/godali.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/CgeObjm/glowroad_review_tamil.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/430d4754e6f.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/cec2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e6e09b-dbf8-423f-be2d-b2000c7c24db/descargar_age_of_mythology_gratis_para_pc.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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 5804 bytes
SHA-256: 13d71dd8bdf953c39159502684b5b63a605b7498244ff823368f75ebee3fce32
font_01_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 10716 bytes
SHA-256: 6bea874cda636843c190601af9ba3f063ebb5487a8da5f77300f49334cccd04c