Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fa63c4a1353c46…

MALICIOUS

PDF

55.3 KB Created: 2020-11-09 17:22:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d45fb477bbc27fb44b0292f109185e2d SHA-1: 48ea8d016d57a1f506b49346b66ae81d76d4a34e SHA-256: 29fa63c4a1353c4681afa5fe1a9163eb46dcfb8d374d6571dc55d5c9b511b178
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafffi.ru/123?keyword=the+bullet+journal+method+ryder+carroll+pdf PDF link annotation
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/beturixudovu-fuserepid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_5f90d269d9cda.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/8943150.pdfIn PDF document text
    • https://xinejusitap.weebly.com/uploads/1/3/4/6/134630468/timotewovivezezigil.pdfIn PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/3440797.pdfIn PDF document text
    • https://totixibepetuter.weebly.com/uploads/1/3/4/3/134345693/4098444.pdfIn PDF document text
    • https://komimuvupelogi.weebly.com/uploads/1/3/4/3/134312664/mokuk-pivikopojasari-kolavaje-jezoxedewiliv.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/128294.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/wujodibu/complement_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f638b005-4434-4154-bbe7-3c0672ae39cc/cassidy_vs_goodz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41bcdbb1-b5a6-4b83-a5b2-00ea9d1f65ba/45267135484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f2f6dd-5112-4bbe-9673-fe87857fe9cd/mejopetivefugumoj.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6965 6444 bytes
SHA-256: ad75a3fb8d1a324d763a8c82389a3e2a9dd8a8c9b196c984c145fe147615345f
font_01_sfnt_off00007926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7926 2960 bytes
SHA-256: 8208f5b4eb11d6f9819bca5bfb2684bb92c29ca9bdf6d488917a6dcfeff2cb87
font_02_sfnt_off000083bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BD 5484 bytes
SHA-256: fb9e4e8e6b927811aac9463f819a3c54cd1a54dac99a78c64de83418d131254c
font_03_sfnt_off00009641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9641 11488 bytes
SHA-256: cce5e1da3ece1484a7cf11bace531fb5eddfee0550775502b40495e72736be08
font_04_sfnt_off0000bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD80 6400 bytes
SHA-256: 5504c7e8e2cca13d9787257ffdc6a00afd3ee36772df75ccd1b7485ed336b0b9

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