Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7c6a38d0bffced…

MALICIOUS

PDF

64.9 KB Created: 2020-11-11 13:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 31d531374e7255b1d7460a8eb93607c9 SHA-1: dc570361164faaaade19c6d1656fade9f55b0f36 SHA-256: da7c6a38d0bffcedbf91f871d3096eff6afa29ffd98ec223c360e4bc89f0da39
186 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/wb?keyword=electron%20cloud%20model%20year%20created PDF link annotation
    • https://mojipolizu.weebly.com/uploads/1/3/4/3/134318612/zoluzas.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/2d3a24769a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f9487952b6b7.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/viponuvubuxej.pdfIn PDF document text
    • https://niweduval.weebly.com/uploads/1/3/4/3/134349673/9152089.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/104b0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_5f8e16db4d17f.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/tasazipow-givuxoxukafe-gisagamatezuwew.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/a6c4afcb-a117-4dfd-887d-4e240adcfff7/rodazulavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f869f12-3084-4cd2-b444-23e5e1582b89/ruwiwogepuvoderuzib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8172ba4-0d03-4836-9488-eaf642fd02ff/34042270960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ceb2ddf-62c2-45f5-8926-13ee75ec41ee/40811583796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c3da42a-363e-479a-b7b9-d48dc2b806ec/53076410892.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_off0000c33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33C 4964 bytes
SHA-256: 6470bed486c7e4f2b8ae646b7f9419f8cf33f10b556b229248a5d8f60f0f5bf7
font_01_sfnt_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 10360 bytes
SHA-256: 84a241947950369be784ff3fc115376f6666bed501a4ce6d893ef14852a9470a

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