Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bac5ad7f6a0b8b6…

MALICIOUS

PDF

69.3 KB Created: 2021-03-12 09:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4b2e764accf8bfeb0b055caeb1317eab SHA-1: 1086858dd59fe3832302d08656813cd7091599ff SHA-256: 1bac5ad7f6a0b8b692e6d29fb0d72fee2c3ad3e08047d2436559fd5581ab1840
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to other content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, potentially for further exploitation.

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://dugedepap.ru/123?utm_term=albbox+tv+sport+apk PDF link annotation
    • http://stal-kemerovo.ru/jubofjljpl.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/guided_motorcycle_tours_europe_201833mig.pdfIn PDF document text
    • https://gupolapi.weebly.com/uploads/1/3/4/6/134629895/9965608.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/2995322.pdfIn PDF document text
    • http://neojust.ru/simple_present_affirmative_and_negative_worksheetsvwe1y.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/jbduibr/94479645375.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/LLkPHib/54684970472.pdfIn PDF document text
    • http://imedo.ru/yin_yoga_poses_for_sleepao1kx.pdfIn PDF document text
    • http://nicechange.space/is_gluten_free_diet_healthy_for_dogszozj9.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/543ce072-1b94-442d-99f3-6f678b53711c/vicks_warm_steam_vaporiser_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db2dcc3-3347-4a35-b2ae-e8a743ba620d/through_which_country_tropic_of_cancer_passes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add2f712-2c16-48ed-9878-295a90b09484/fudexew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a588c64f-ad0b-42ec-bc98-285fc9b0d4c3/12331974136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5753f240-d9a9-4c77-a38a-fd75b69747f8/toxiwijomidajojotalid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870abd14-6207-4728-80f4-ad475020c191/molaguxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcbe3d5f-c867-401a-ad8c-b1f8e5272a64/87673301440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b4f5e6-2e38-4747-9d22-f26605ceb22c/insinkerator_badger_500_not_working.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_off0000d178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 5132 bytes
SHA-256: 9fda1830607fd9d443cd1d86d556c4393818e061c911454901dda66ed1a89baf
font_01_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 11292 bytes
SHA-256: a6c2e0ab7fc1ece3454a05fa7fddda0e59946a815c3e299a0f90a5eba46fda12

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