Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae445322485d281…

MALICIOUS

PDF

81.6 KB Created: 2021-01-11 23:07:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c445e9cfdef36c8f0ac9257f08dcd865 SHA-1: 381e524f743b26df8108673a292a2a18f4d6139d SHA-256: 3ae445322485d281a887d15db04fe0d937a9cdea8effd5e03f32ad98f9462df5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the PDF structure indicate an attempt to redirect users to potentially harmful content.

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
  • 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://trafficel.ru/123?utm_term=megaman+x4+order PDF link annotation
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/8646247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_5f89488d92bfb.pdfIn PDF document text
    • https://site-1175201.mozfiles.com/files/1175201/advance_auto_parts_battery_exchange_policy.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/e64bf19ff42461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5fc40b99da073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401985/normal_5f91ccfa0e0b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5faef8c049c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5faf0b77f2305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486346/normal_5fe17f02d47d5.pdfIn PDF document text
    • https://site-1191564.mozfiles.com/files/1191564/color_sms_keyboard_apk.pdfIn PDF document text
    • https://site-1176787.mozfiles.com/files/1176787/65802759044.pdfIn PDF document text
    • https://site-1168098.mozfiles.com/files/1168098/31505471085.pdfIn PDF document text
    • https://site-1172092.mozfiles.com/files/1172092/cobb_theater_merritt_island_movies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 5096 bytes
SHA-256: 359b3ab3279c468b226290345f891c4294f565f837be33e67a0dfaaf74f3fffd
font_01_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 10404 bytes
SHA-256: 6ff718d953ea92bb151428223893bf0ceda6619c5fe1bebc7826ff38c366c38b

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