Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1425c98022cd2c9…

MALICIOUS

PDF

116.0 KB Created: 2021-03-15 00:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d909b9617298c67437c3b6f5b7ccbab0 SHA-1: 1517930b2c38d9678f9a77fb31286101c27b3e32 SHA-256: f1425c98022cd2c9895cb110c032e104c2581cd6d7a13035dd3a0c6e8b1d9c74
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://lozipotod.ru/123?utm_term=borg+warner+t10+rebuild+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402964/normal_5fe0df3a738b7.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/f1224c3436e44.pdfIn PDF document text
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/jefosedoteza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_60270a16b09d0.pdfIn PDF document text
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/3375771.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482870/normal_5ff2b2a603809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_5fd7b16a4c218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_5fea42a989df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384463/normal_603f7c159c688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452865/normal_6010cb8ad2c9e.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/dijadobaluseg-bomutoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484618/normal_5ff76c6001896.pdfIn PDF document text
    • https://pizalekelakeg.weebly.com/uploads/1/3/4/3/134376537/togifudeba.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/497de8e5-1bfd-42ce-957a-b746fc9590e0/how_to_be_a_good_christian_wife_to_your_husband.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7ba1c3-9f51-45b6-b22b-253cfc1f9e43/ohio_common_core_standards_math_8th_grade_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a5d19d-8423-4f8b-be48-4335bda9ae96/tricky_math_questions_and_answers_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3184271e-f34a-4963-9ed2-d5182d3ce1d8/banifuropevog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d8b51a-466e-4c75-9188-f5b9ebbd9ed3/13877668631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f2aafe-b6f6-4ec5-a6f6-1b86450e8cfe/what_will_land_first_a_feather_or_a_brick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492aa871-ca58-42ef-94a2-47f95aeaff85/download_tajweed_quran_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71dfe4d5-ca1a-41bb-b024-c38c252d121f/20920526836.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_off00018ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AB2 5444 bytes
SHA-256: 3c18f775e97efef0d74bbda1f4508669141ec57afbee0765c0c013ff32edb757
font_01_sfnt_off00019d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D33 10828 bytes
SHA-256: d1a9eb106375a3257ea3bd2ab9b0c53232ff592e9bf43f6a1177cdc0196f096e