Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbd1dfa352c8fa1…

MALICIOUS

PDF

73.9 KB Created: 2021-01-13 22:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 771335bc7ceb3615cfd4b881f629df3d SHA-1: d6a5aeb85283c4767853347e48c0a595dc60333f SHA-256: 1fbd1dfa352c8fa10f629abd8d96cbc665bf7cab2d8fd2db806befc2674b1e3a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffnew.ru/123?utm_term=tree+patches+osrs+locations PDF link annotation
    • https://site-1175354.mozfiles.com/files/1175354/wuwebezakiluvesoxunojinez.pdfIn PDF document text
    • https://site-1174832.mozfiles.com/files/1174832/2332828751.pdfIn PDF document text
    • https://site-1177364.mozfiles.com/files/1177364/espn_960_podcast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_5f8c69908f755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5feb55345d2b3.pdfIn PDF document text
    • https://site-1177407.mozfiles.com/files/1177407/94381478781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_5faacc58cf972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368221/normal_5ff67c223ee11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_5f9fa28552ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5fa1ae09ad0c0.pdfIn PDF document text
    • https://site-1173528.mozfiles.com/files/1173528/womewejowavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_5fb5c48c14b88.pdfIn PDF document text
    • https://site-1175916.mozfiles.com/files/1175916/36566637821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5ffd9f14abeb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420235/normal_5fc0d4cfe377a.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/vetamedisoz/gubajalefejixozo.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/23452935653.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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 4968 bytes
SHA-256: 19e7fbde283315e0cf69518372391d650658e8cea07eb47e91b06ea4f9f3f35b
font_01_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 10952 bytes
SHA-256: 4d86d36f1f7949667f11fc240559e1ed23cff5856826a82655b594552e4b49b8

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