Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb826f245390268…

MALICIOUS

PDF

65.2 KB Created: 2020-12-20 13:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: da3bba2d85c4404b773bbcace15b4f47 SHA-1: 9101088a3554916953363096541303b3e8054399 SHA-256: ddb826f24539026851cf32909b7c3bd87a8cbec15be45c9c91317bc9e605171c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://trafffi.ru/123?utm_term=bohemian+rhapsody+piano+sheet+pdf+free PDF link annotation
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/mojawonup-sinaj-midunolubixuni.pdfIn PDF document text
    • https://vobiromab.weebly.com/uploads/1/3/4/6/134653190/vanerepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_5fda38e602cf4.pdfIn PDF document text
    • https://pufotawimudob.weebly.com/uploads/1/3/4/3/134380049/gupuxolip-sokozimadofaj-muvosun-wupijebawunakot.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/rirapiveko-totikamuxome-baparifub.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/4904742.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/tofozodukatiwez.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/lenazapezesa-nilukozaponewa-wasedux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384817/normal_5fdef8c1149b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/winumigutam/80206812428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b153179-6efa-48f9-937e-596ab18c188a/71063745876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b12e441-0349-46b0-8e91-847e7e2d427d/sigobavu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D9 5400 bytes
SHA-256: 11911ca0963b9493f37b8c95738981fb4445dbaf3ac8053a049994fea7abf6b7
font_01_sfnt_off0000d513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 10272 bytes
SHA-256: 9e1acd5fa90f665c75ffdd10a5754856399cfd5c3f3f06efd4b3236b69e866ff

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