Malicious PDF — malware analysis report

Static analysis result for SHA-256 05643ee90471e816…

MALICIOUS

PDF

71.0 KB Created: 2021-01-06 16:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 62a460966d391b0c9f670c4f3d8c2b1c SHA-1: 66800cf2947197b3b725cda1d0c30e3159d63cb8 SHA-256: 05643ee90471e81675b8c6f2a5d70803ec4daf1295de93435ecf583368aebcb9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to potentially malicious websites, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=dangling+participle+meaning+and+examples PDF link annotation
    • https://nunigagajil.weebly.com/uploads/1/3/4/7/134751499/kuvakixa-ravag-nepozekeforitu-lalajagoleluw.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/nadujuvorimev-jimifeti-gokubusijep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fd2186133247.pdfIn PDF document text
    • https://regenapewafixun.weebly.com/uploads/1/3/4/3/134364718/cecb4badc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f8a86292e3e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_5fc2f3c31c9a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403676/normal_5fee82474cb91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f924513cfa50.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/KQyPiaL/du_screen_recorder_app_apk_download.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/30499401-0857-4860-8191-ffe67d1beee5/40747533289.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/vocab_level_e_unit_11_answers.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_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 5460 bytes
SHA-256: 18abc92c602ce9dfe062ffd035cee2a1a844c74c985773abddc88c3e9014c710
font_01_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 10920 bytes
SHA-256: 7c45fcb711908467e96035269945ffc3cb391fbd00e13448defa00aa8ffabb1f

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