Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b7034ed0eefc5a…

MALICIOUS

PDF

63.9 KB Created: 2020-11-22 09:04:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bafdd9b15895e6fe1cf2102b741a8a38 SHA-1: 216cbf793871a0c664998adeb75be2897a4dbdda SHA-256: a2b7034ed0eefc5aa5bfbe82f15a6ef66d6e0a4148f41e8d7ecb01ac9973912c
156 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 0.9998

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://traffking.ru/123?utm_term=acls+pocket+card+pdf PDF link annotation
    • https://kaxebovirufuj.weebly.com/uploads/1/3/4/3/134399635/kevapoval-doxekani-pokoxapagik.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/videwexorebeduzip.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/tasabovodabat.pdfIn PDF document text
    • https://kufesolujuxubi.weebly.com/uploads/1/3/4/3/134373324/40ef03de39f2.pdfIn PDF document text
    • https://nijenemal.weebly.com/uploads/1/3/4/4/134465501/joriw.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/kofabube/9763691717.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/wedding_anniversary_status_video_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648392db-a03e-474d-bdb7-baf4d8948745/paper_princess_peach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1805661-adbf-496c-82e1-3537e44e7a2f/josh_jones_crappie_guide_ok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada702b3-a8d0-4eb6-a07c-c43d3fae7866/the_other_foot_ray_bradbury_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/cayley_hamilton_theorem_proof.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_off0000bda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA3 5200 bytes
SHA-256: 356000339547ee466cb3b5fa550c407c6da1cb1e168531a86aafcd8a6ac28e71
font_01_sfnt_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 10592 bytes
SHA-256: 4e1dd7847ec241ac886e635acbecb84f046f875ec594e628b7e42d0f3e549355