Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f4d891b77a0713…

MALICIOUS

PDF

72.4 KB Created: 2021-02-22 14:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e8c0cb82007b4eaf51bfb06767b8e126 SHA-1: 8087973c2c50404fcd060a32c157e0cd9d744f5d SHA-256: 80f4d891b77a0713ec075d56bc69491c36d7469623d7e61fdfe8e529d9e0ec10
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to suspicious domains and are flagged as potentially malicious or part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=what+is+a+smart+goal+example PDF link annotation
    • http://itdiscount.info/wasutesojereregujraotc.pdfIn PDF document text
    • http://b4shop.icu/kikagajar8psnx.pdfIn PDF document text
    • http://usechambre.xyz/69058571189z3cpt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_6014a40a25347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465123/normal_5fdad4f1cf632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451217/normal_5fdbd37e49927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_601d76fe366f8.pdfIn PDF document text
    • http://hermidkovo.info/27790339676eo1ua.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5ffbc5dc4a004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_5fe7389f28754.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuxexagixib.rf.gd/esc_guidelines_diabetes.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/74480602099.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/borbaad_movie_video_songs_pagalworld.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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 5312 bytes
SHA-256: 299900c3bb4c1e3bc9178c795e81b17bad60068fe5116510f349b5287d12dcda
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 10472 bytes
SHA-256: e8102a9683a243f5b0eb15ea8c99f9ebd7b8f515163c9d979fb2a872257ef527

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