Malicious PDF — malware analysis report

Static analysis result for SHA-256 29be141804be07a4…

MALICIOUS

PDF

89.3 KB Created: 2021-03-23 18:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9440d09aec3ce4a32a1a131ff0ba3053 SHA-1: 7cdfa70a8500f773f8161ef48df55048c219397a SHA-256: 29be141804be07a47a05f77d930696b98e0b695d3cf51c0541b72aab1bb78843
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 pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier strongly suggests malicious intent, and the embedded URLs are the primary indicators of compromise. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=albert+camus+the+stranger+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443357/normal_602067ba85fc6.pdfIn PDF document text
    • http://fridgeservice.ru/menufedaxivepukowu7g857.pdfIn PDF document text
    • http://topsalon.xyz/66548625607aw41k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_6031725c84a70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470408/normal_60228cd61ee80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_5fd81af409cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495043/normal_6033f683f06a3.pdfIn PDF document text
    • http://sodahq.club/fesazixaje8sbry.pdfIn PDF document text
    • http://yazansoft.com/microelectronic_circuits_7th_edition_onlinekbgx5.pdfIn PDF document text
    • http://scoretdho.best/perejozatulusn1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417998/normal_6013c5d3b0aaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_600e30d86f0ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21036261-01f9-4725-a342-2b8b08d10099.filesusr.com/ugd/d0cbc4_0691ed20fae04f0cad2a9d983363f0f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/descargar_biblia_catlica_de_jerusaln_gratis_para_pc.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_e459de7c651c443aab0053957bfebb3c.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_de20e4e409a84b158eb716134d73cf16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/pogo_tv_mr_bean_video.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_0340040af1da414194a25e6eb7f61086.pdf?index=trueIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_b20daf3c60e94215bb927b1187ea73fd.pdf?index=trueIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_be209be2878546cbaedecfa73dde00c1.pdf?index=trueIn 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_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 5700 bytes
SHA-256: 7687e06f302bd5ae8e0aa660c31c9abb04b8ada4f02ad712e6f237246574b18d
font_01_sfnt_off00012ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 12176 bytes
SHA-256: c61af22da794d471963b5b2d175f4671e862b14bdb6391c94c0a37e111c14212

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