Malicious PDF — malware analysis report

Static analysis result for SHA-256 199022b9d856d3ae…

MALICIOUS

PDF

86.3 KB Created: 2020-11-13 21:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 916fd9c7b16ebbbc2be0435a69e4de0d SHA-1: 92b308972746e6b1bc992c81bf435a7f1e2c9446 SHA-256: 199022b9d856d3ae9dd365aedb0cc018ed64f66112f33a0bc3f8bc4e1d428779
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external PDF links. One of the primary URLs extracted, 'https://trafffe.ru/123?utm_term=analysis+of+the+cask+of+amontillado+pdf', suggests a potential SEO manipulation or phishing lure. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a malicious document designed to redirect users to potentially harmful content.

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 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.
  • 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/123?utm_term=analysis+of+the+cask+of+amontillado+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383579/normal_5f8ced241a547.pdfIn PDF document text
    • https://dabatipiregu.weebly.com/uploads/1/3/4/4/134435287/wabobikix-jixukeladorov-riwesagiledire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_5f98801384fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f8765f62a63b.pdfIn PDF document text
    • https://xeruwuxopexok.weebly.com/uploads/1/3/4/4/134467304/namurine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5fa8bcb328f6d.pdfIn PDF document text
    • https://zoxaminajoge.weebly.com/uploads/1/3/1/6/131637873/rebakomexusiso_zemagelarew_xituvuf.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/0da3dce0-4aa5-45ce-8baa-c515665a204c/6593412282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b4d1e3-87b1-4aad-b460-c834cb12e09d/lovamajasetajola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ec3a6b-00de-42e5-895f-1065fb8b7dc0/sidopewaxudakitukogonuxul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c04a30-23f5-4dce-902d-7a250f7124f7/wigejutud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113a41d1-8977-48f6-a656-1b5667275f8f/81724731975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a05f724-9ace-42cb-a8dc-e000341bdd97/what_makes_a_decision_strategic_check_all_that_apply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557dfa4d-c639-4b33-97d2-5f5039d21802/kegefinidewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d14d24-e0d3-4791-b56a-2ff251b35541/wijazewewukuvuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f309898e-8b1d-41bd-8f82-69f0673dedb5/statistics_formula_sheet_class_11.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_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 5452 bytes
SHA-256: 18e0fc5ad0078eed6afb66941e182727f46d5ca030d04f5696b5f555d8a0c038
font_01_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 11548 bytes
SHA-256: 29ee6f08aef020db30fce175d4cb2dd98b3d5003667728d0c29061429111e96c

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