Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb946f1af12c553…

MALICIOUS

PDF

36.9 KB Created: 2020-11-09 01:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3dc8e52bd25203d22a6af03c2f9cf2a9 SHA-1: 4830518bbe895fd6ded14253f058bb33f8086f23 SHA-256: 0bb946f1af12c553eee189fd53714e54ee53cb2ad395b89f400b7cf314c98c71
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 spam operation. One embedded URI points to 'traffset.ru' with a keyword suggesting a lure for a product manual. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm the presence of a link farm.

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://traffset.ru/123?keyword=arlo+pro+2+4+camera+manual PDF link annotation
    • https://nopivetof.weebly.com/uploads/1/3/4/5/134581756/gonireduje_tafuxokoginufes_dikisotawupoj_vilajewikada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f915c4a4ec4e.pdfIn PDF document text
    • https://tijaworiluwulu.weebly.com/uploads/1/3/4/3/134363233/wewozud-lupusurovod.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/xoxezal_vodapusej_pulobuvodibepo.pdfIn PDF document text
    • https://kuguzozivef.weebly.com/uploads/1/3/0/7/130739994/fuzujabiboxito_sefekokapuz.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bagatazojiz_sidatasofugugor_sofaxazute_gureluf.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/e4ffb1b6-d181-414a-b6f2-091b60176554/the_options_playbook_brian_overby_free.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/merozasopegujibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8f079a-3242-43df-b133-fb76bc5298a1/guide_series_hunting_boots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4568c44-8ab2-434d-a811-0a8355c62dd1/gibekunuzidoxamidepaneb.pdfIn PDF document text
    • https://silisejez.files.wordpress.com/2020/11/51625267670.pdfIn PDF document text
    • https://vuxeginup.files.wordpress.com/2020/11/43030790395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a96fb6b-f11b-4b73-824e-bfd8b4f0f6ce/78906997806.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_off000050a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50A5 5112 bytes
SHA-256: f5c48d1a361f223380bf783eb1df382bda3376d2cf1db37f1999af2139a6405e
font_01_sfnt_off000061fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FB 10820 bytes
SHA-256: 3ef62c65928d136fe593848db9e9d4d419d31bd5dac35948c32ac635a86b9535

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