Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58eadb28206ce65…

MALICIOUS

PDF

74.5 KB Created: 2020-11-12 17:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 83768455c45a34123b4021aba6e930a4 SHA-1: 6718f7d607a671e6f752cc893b35631537f472f1 SHA-256: f58eadb28206ce652e966aec22d4825304b874e3b5ff825ab9e9322904ad4908
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, including a critical link to known malicious redirector infrastructure at 'https://traffmen.ru/123?utm_term=bidding+in+the+21st+century+pdf'. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to redirect users to potentially harmful sites, likely for phishing or malware distribution.

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
  • 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://traffmen.ru/123?utm_term=bidding+in+the+21st+century+pdf In PDF document text
    • https://daletapobuwero.weebly.com/uploads/1/3/4/6/134666872/6960034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_5f9e35fcbbb6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5f927e5bbce40.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/1225110.pdfIn PDF document text
    • https://bazanepuxakelu.weebly.com/uploads/1/3/4/3/134346533/walasidiwom_punireva_xadokugodabo_jelor.pdfIn PDF document text
    • https://xomipuladijig.weebly.com/uploads/1/3/4/4/134401164/971f6d609d3329a.pdfIn PDF document text
    • https://jevusesapa.weebly.com/uploads/1/3/4/7/134765100/8831230.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rotesojelunemiroto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f8ab085b202b.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/0b1709aa-b28c-4db0-b124-39478266a208/18622342698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd03a1b-c7b7-4e6f-8ae6-be3ac2a46655/tumoxitaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379ed17a-3211-463e-8048-11efdd578359/teacher_observation_checklist_for_daycare.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_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 5508 bytes
SHA-256: 112e2c7a06edae6bfc4a54385a0b9dc570ff817ccc370288c3ac53fb1789f40c
font_01_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 10864 bytes
SHA-256: 611769c83d9c960c2e16348327adaa9dc3a6f410cb4d18464644c5cbde54d9a0

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