Malicious PDF — malware analysis report

Static analysis result for SHA-256 149e90e5c47193d9…

MALICIOUS

PDF

74.7 KB Created: 2021-04-07 19:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 642adefd0f5164fc478c806722999689 SHA-1: 79b23d1c8dd83fbfabf8cdf815b6865811714ffe SHA-256: 149e90e5c47193d9ff207158785671a397aae247344f07ba5d2593b7bdb8ef64
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings, particularly the link farm detection, point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=alliance+x+empire+guide
    • http://thehensleys.org/zutoxifapijixaz6kh8k.pdf
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/ravovaze.pdf
    • http://xerujupuje.sportsontheweb.net/14035521224.pdf
    • http://eurozone.pro/does_evening_primrose_oil_induce_labourpkm0x.pdf
    • http://hookup671.site/calotropis_procera_morphology9xcwa.pdf
    • http://pazifelurup.medianewsonline.com/pdf_blackout_text.pdf
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/simasekiki.pdf
    • http://samyog.ru/how_many_hundreds_are_in_50000uzuwx.pdf
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/5e5f90e1554f0.pdf
    • http://xozonline.ru/features_of_functionalism_architecturejwclz.pdf
    • http://flebolog24.com/where_can_i_buy_inexpensive_ribbonyfrqm.pdf
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/7605291.pdf
    • https://cdn-cms.f-static.net/uploads/4405660/normal_606016c09b4fe.pdf
    • http://genusadnlo.space/how_to_reduce_stress_for_college_students4m3y3.pdf
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5feff41b88973.pdf
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/tetuwi.pdf
    • http://7gusevshop.space/sazurajewaniz9jxo2.pdf
    • https://static.s123-cdn-static.com/uploads/4369495/normal_5ffbb97ab5cc1.pdf
    • http://lozhobelir.space/como_se_llena_un_formato_de_carta_poder_simpledbvea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e673.bin
6a0e90e067463f180163fc918800c4678d3abfa963633bd52611797e909bc52c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 5272 bytes
font_01_sfnt_off0000f84c.bin
2dff2a84bd488b9ead1682a4ed19a6cbcb8aeb19e9bc0919c7372b7f06bfdcdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 10456 bytes

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