Malicious PDF — malware analysis report

Static analysis result for SHA-256 639ec736918285ef…

MALICIOUS

PDF

84.5 KB Created: 2021-04-04 08:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d30e2a5e4f5da3ed37037bec96c91559 SHA-1: 7d72fa05ef93c5507b7a08cb5407425a2df29cc9 SHA-256: 639ec736918285ef7776c79a6454231d0278c31c77a40cd6b1220d67231294bd
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially harmful content.

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
  • 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://seumenha.ru/strik?utm_term=is+glass+wool+insulation+fireproof PDF link annotation
    • http://dabosesavedevet.medianewsonline.com/77235833809.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446914/normal_5fe16b6a648de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449001/normal_5fddc952b555b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5fd0c2d73b76e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_605a4868a17c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_5fd8b827807c2.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/4597000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_6060023a0dd58.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/72853876898.pdfIn PDF document text
    • https://xekuruwagimutuz.weebly.com/uploads/1/3/2/6/132696141/bamikasagebolugile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_600b67fd61a21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427785/normal_5ff17a745a80b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470402/normal_5fffbe2226a2a.pdfIn PDF document text
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/6908528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412391/normal_5fe03de22506f.pdfIn PDF document text
    • https://nokafixawawi.weebly.com/uploads/1/3/1/6/131606940/giroguziniv.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/b2fada72-36df-40ab-a7c6-1c0945a2e8b2/bushnell_cellular_game_camera_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91054ee9-be41-4711-9294-c1cb2b88341c/how_do_you_reset_the_service_engine_soon_light_on_a_2007_nissan_altima.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/97129209703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b875c5-be6d-49e3-930b-79cdd40f352e/399680665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5610a6-e838-4537-b7cf-7d2a93c4080e/kurubotinavavik.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_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 5100 bytes
SHA-256: 965d3f399e898a6b7d90b699321db0bf37bc44769c4ef6526e59e3da0f032e1a
font_01_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 11348 bytes
SHA-256: 4bf714adf25e7fca73737611b88571c0dc52e7c9601e6dbb4e71962c1564f33c