Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf074ac2d487810…

MALICIOUS

PDF

84.3 KB Created: 2021-03-30 16:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 46ffe49b7e070aa185c40deab4f5669e SHA-1: d02ce0967b4940e452dcfd7f04647df92c55c1e8 SHA-256: 1cf074ac2d487810e916263433f7b86b1ddfbe7bd082b6c147f723d74759c83c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URL and the document's apparent purpose of directing users to a link farm are consistent with phishing or malicious redirection tactics.

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.
  • 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://soxebez.ru/award?keyword=variance+bias+tradeoff+pdf PDF link annotation
    • https://cdn.sqhk.co/zojoguxuban/wjbwtN8/concatenate_null_values_in_crystal_reports.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446650/normal_60068fe0e61ce.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/dfgchid/rockstar_full_movie_hd_free_480p.pdfIn PDF document text
    • https://cdn.sqhk.co/serojimo/SftB3Ee/jigez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_6046b00a5f8fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5fd7c379eceba.pdfIn PDF document text
    • http://fuviguz.22web.org/introduction_to_psychology_noun.pdfIn PDF document text
    • https://cdn.sqhk.co/sapamine/jd9BJhe/rimotalifepibakevol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393028/normal_5fdca347ec455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_6284d7b480fb40c781f7417c3b370393.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/fuditefejomubupojosimel.pdfIn PDF document text
    • http://ronojegev.rf.gd/zamugatudujewomixival.pdfIn PDF document text
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_a4e30c6ef8fa4c4f808340d657e4aacb.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_bf96765431574ef4a4af6d89c3223a42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/fax_cover_sheet_template_microsoft_word_2007.pdfIn PDF document text
    • http://xipipowateselok.epizy.com/whats_the_healthiest_coffee_at_dunkin.pdfIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_f7739dae7cea4997b10816a096da6d28.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_bb03e52e322c43cdac54150b94347ad7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fodose/84211220699.pdfIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_53491375d85c45c2a4efe882cad4f6ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/1279207315.pdfIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_5d340a6b6b7f497dbe58b669f6b40e22.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_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 5224 bytes
SHA-256: 5269bbd6a64eacce2a23b776b79fff06d359fe69284a569b6f15c12948483179
font_01_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 12380 bytes
SHA-256: fc7d3cd8230405215982268ad1951c10aa2ef83675f4711e7fa081aac56502ce