Malicious PDF — malware analysis report

Static analysis result for SHA-256 a823a3a4b5563de8…

MALICIOUS

PDF

70.7 KB Created: 2020-11-13 15:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 342061c348a98cc57bc378a1bf78e52a SHA-1: edf3d66dd95418910f809cf9c4a1663ba4b8c80f SHA-256: a823a3a4b5563de8498a620157d641a860b40e72916cdd25dec95f7c8d51b7b3
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary URLs, 'https://trafficel.ru/123?utm_term=the+best+and+the+brightest+pdf', is flagged as unknown reputation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or a link farm designed to distribute malware. No scripts were extracted, but the PDF structure itself is used to host malicious links.

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://trafficel.ru/123?utm_term=the+best+and+the+brightest+pdf PDF link annotation
    • https://vabejodero.weebly.com/uploads/1/3/4/3/134378136/pebefopijufezubawaze.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1441493.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/bagaforop_menif_tofafa_gevokidiz.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/6121330.pdfIn PDF document text
    • https://luwovizebezew.weebly.com/uploads/1/3/4/4/134482442/6501223.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/12f591a9-dbfc-44b9-9cee-8032db1cdddf/alpha_werewolf_eyes.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/optex_ivision.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/madison_middle_school_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35bf96d-6519-4c7e-92de-3b727edae765/jodiritenavem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4206e8dd-d1d2-4b3a-81bb-d420c70dd19a/fudojid.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/skyrim_darkwater_crossing_dragon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c1eeec-d6c0-4389-9da4-e5b35a159f72/3567810289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21496bad-7431-415a-9ec7-826688ffcf3f/4632343578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee19866-1e97-469b-8a3f-008e44122a03/7671708258.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/86187375887.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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 5360 bytes
SHA-256: 85327b4e81f0a20a224cce79e77732612b26903a797558c7f73c3524158ba1ad
font_01_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 11428 bytes
SHA-256: 6c98fcb05c9bed6a01704783ecff1b50bbc5be37fcaa00c80defe9bddfa404bf