Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d12b2e5498d580…

MALICIOUS

PDF

80.0 KB Created: 2020-12-02 23:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0dc677695579e7ffe7da38eb1ecfdaf7 SHA-1: 5dbd0dbcb214df022d9d6da741d865dc83115c81 SHA-256: b4d12b2e5498d580bce5f04ed6c8a8ec2877d79bfbd064de0c73280153b9e37b
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on file-sharing services and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and a 'download button' heuristic further supports this, suggesting the document is designed to trick users into navigating to malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/123?utm_term=blue+oyster+cult+secret+treaties+sacd PDF link annotation
    • https://penelusoluko.weebly.com/uploads/1/3/4/6/134699361/kujuse.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/0e1ceeaaf1897.pdfIn PDF document text
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/vagejux_nunemofu_zinerefezodoxol.pdfIn PDF document text
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/robixiguxal-sabenekikopi-dukinijuka-kigamawa.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/jowepifaz.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/wilugugo/68280778906.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e22088c99b6d37b43119/t/5fc521a93570fb44d1a73e3c/1606754729970/pamip.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29d8640f1034a5cb3e639/t/5fc6fcf2b2fa4660c8c83e10/1606876403171/rocketman_movie_music.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/redhat_linux_lvm_cheat_sheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c1ca2bbd74065805c248/t/5fc60153e6d49a06bb6175f3/1606811989116/dilewusigoviza.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc124bf3dfdd95b60d690c4/t/5fc4770b5147b14804c1cf30/1606711055086/the_norton_reader_13th_edition_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf66b00f7af3919d2fbd9/1606219371775/sifinesak.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/devilman_no_uta_original.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_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 5084 bytes
SHA-256: 21d8f0d5f7e0cff75ece5423fa298398fcda21fdc83f09025c53c8c984fbd23a
font_01_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 12396 bytes
SHA-256: b5c41da7af353ab22d9de1b8d9ecc677308e8de43efd8b3f0fd5fa63fdb5619a

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