Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a71367e823a583…

MALICIOUS

PDF

85.5 KB Created: 2021-01-03 07:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 977fe1d6fd3f0accb66f9766577bc8ec SHA-1: 497269dc492b471a9e14518695c34951995c0979 SHA-256: a6a71367e823a5837f2522efd695930510a391e08d6e769853b6192f746e6bb2
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links pointing to malicious redirector infrastructure, specifically 'traffmen.ru'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' indicates a phishing and trojan payload. The document body, though heavily obfuscated, contains text related to the URL's query parameter, suggesting a lure.

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
  • 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 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/aws?utm_term=friedel+crafts+alkylation+of+benzene+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_5fbb056fb6338.pdfIn PDF document text
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/afa9eae25a66.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/nanalu.pdfIn PDF document text
    • https://cdn.sqhk.co/jilelemo/cCwhfpJ/6239349233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_5fb7ba12bc7ad.pdfIn PDF document text
    • https://nodemudikukurev.weebly.com/uploads/1/3/5/3/135348567/f24d050bf55.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/4899764.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/free_physical_education_powerpoint_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b28866-a68d-4035-acbc-ce46fa5ad874/xuvezezutivininixuludu.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/ess_login_caesars_employee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69fae45-7f63-4976-9b17-ea1c47eb8c27/73113866530.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/bagiwomu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 3000 bytes
SHA-256: b482d22b722c394d84b00da9f8094d8dcee20b90f8113908b48d380abfb06400
font_01_sfnt_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 5460 bytes
SHA-256: 1540fbcc2a81b7c8058c4be959033f3bdeaca1ffc6bfae68ff91b1d9708833e0
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 11100 bytes
SHA-256: 21631f1e77d408862cb60a59e90116a82491c731056b66b87e8c5a759819b21a

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