Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd31473704d7647…

MALICIOUS

PDF

69.7 KB Created: 2020-12-11 09:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3c27fdebc4b28bfcc8a5c1721dbb6874 SHA-1: 217f20e44c23f5a14f729afd595058160d498250 SHA-256: 1dd31473704d76478c1f5335530b922ccc36b32075c42e9f7432210afb9e6378
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to a suspicious URL that appears to be a redirector. The PDF's structure and embedded URLs suggest an attempt to disguise malicious content or redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?utm_term=harley+davidson+2010+touring+models+factory+service+manual.pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488807/normal_5fb041086cc5a.pdfIn PDF document text
    • https://jojimixumomural.weebly.com/uploads/1/3/4/4/134438106/puxumojeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499300/normal_5fad8f9969c57.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/sevulexoguso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388626/normal_5fa3bda07d299.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476445/normal_5fcbf34ebc7c7.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/varoximu/arabic_letters_a-z.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f3b9a5bc066edfb302dc/t/5fc4b5123f75b16643691433/1606726932761/zhou_dynasty_inventions_and_achievements.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1412bcd1e280355d6a3a9/t/5fc43e6b4f98375720663f0b/1606696556046/tukeradezebewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e016c3bf-83ed-46c3-a3ff-f7037bec3755/21628161314.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_off0000c4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EE 5956 bytes
SHA-256: 0dc94a9d752248ae4ba71735025724e727e17e248a6abebf6e30551713f3082f
font_01_sfnt_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 14744 bytes
SHA-256: 443e1419df1e041d1766d39c1a9b5ced8a27b926104fb2ab69f3bf01d20dd91a

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