Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbaf9c2b0336561a…

MALICIOUS

PDF

72.1 KB Created: 2021-01-10 21:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1f16a851a5aa08ed1c81afbc9de091e8 SHA-1: b6b1cefbf1014660306f5421624831495992ae76 SHA-256: bbaf9c2b0336561ae2ec8b6fcfc983f446d88a8d32c9d2e367286106cd740c46
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable or compromised. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with phishing or trojan delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=is+plastic+marked+1+recyclable In PDF document text
    • https://xaniwunedevivat.weebly.com/uploads/1/3/4/4/134470123/9cca93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_5fa12727c6c36.pdfIn PDF document text
    • https://site-1191329.mozfiles.com/files/1191329/pomunazokapad.pdfIn PDF document text
    • https://fajubixinusejeg.weebly.com/uploads/1/3/4/8/134850070/xivibeluposuz.pdfIn PDF document text
    • https://site-1166657.mozfiles.com/files/1166657/best_kpop_store_in_nyc.pdfIn PDF document text
    • https://site-1177444.mozfiles.com/files/1177444/33454714217.pdfIn PDF document text
    • https://gelujesu.weebly.com/uploads/1/3/4/8/134847850/nokijagalefovu-fakuxiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5fd2546ab943c.pdfIn PDF document text
    • https://site-1178153.mozfiles.com/files/1178153/cash_gift_taxable_limit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_5fe6862a7c38e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5fa74d08235e0.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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 5516 bytes
SHA-256: 26e6b4595fbeebbcaf97e1e522dc38014369634c8459102c10be5fbec33aea56
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 10780 bytes
SHA-256: 690be8571727fa1681599f418bf344cd849ea3ffd1e6092413f36b78a5f9f70c

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