Malicious PDF — malware analysis report

Static analysis result for SHA-256 d591b3ea9fdf3ec4…

MALICIOUS

PDF

85.4 KB Created: 2020-12-25 00:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b09967823c02c7f13231ebabcf165494 SHA-1: ec1ef6833bb31503da6c46e377b599364e0e3d14 SHA-256: d591b3ea9fdf3ec48b1f1b319027da3c0d69b277c28a939c31a4452f635bd3ab
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded content, though heavily obfuscated, likely serves to redirect users to these malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/strik?utm_term=sad+piano+music+chords PDF link annotation
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/85d21323e05.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/jeOgdhj/rafusivuwamidanafuxaz.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/cibGjeG/poblano_enchilada_sauce_recipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_5f972c21abd5e.pdfIn PDF document text
    • https://jijidiwudop.weebly.com/uploads/1/3/4/4/134481930/zurowe.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/jagghhd/29358342349.pdfIn PDF document text
    • https://lazekikobetilof.weebly.com/uploads/1/3/4/4/134443651/dabekobeboja.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/bedijenutowulixa.pdfIn PDF document text
    • https://fimibiwuru.weebly.com/uploads/1/3/2/6/132696060/mizorezixepipu-takesenexapi.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/wesani.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/158c3e9f-6228-470d-b6a8-aaef24ab7e22/45578672895.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 5384 bytes
SHA-256: 3a500a03fd78f842a891db032a84cc63b2d7ad39c61a44cefd269bc0a26a7e77
font_01_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 11560 bytes
SHA-256: 8d87890cf9b41510fee6750669a3bafb057dd2f1f3b854de4dfad33fb80052b8
font_02_sfnt_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 16100 bytes
SHA-256: b59afbb2f683942213df284fd86cd9422ada0c5f1ffac7698db8c94a40390bc4

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