Malicious PDF — malware analysis report

Static analysis result for SHA-256 34aca35f0368049a…

MALICIOUS

PDF

84.5 KB Created: 2021-04-07 01:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d628148f439b3c28e9cf6bad0139ae1 SHA-1: 1294d20e3627af3e8d9c821c6c5eee23d387c3f1 SHA-256: 34aca35f0368049aff8608c4366fc273be7240b4e36a33e3156d68b3a5f52112
186 Risk Score

Malware Insights

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

The PDF contains a deceptive title suggesting a job application, but the primary function appears to be a link farm. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one prominent URL being https://botokaw.ru/123?utm_term=allied+insurance+job+application+form. This suggests the document is designed to redirect users to potentially malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://botokaw.ru/123?utm_term=allied+insurance+job+application+form
    • https://zugatesek.weebly.com/uploads/1/3/6/0/136082504/e44743fd093df.pdf
    • http://dasiwujupuna.sportsontheweb.net/activity_diagram_symbols.pdf
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/mevakibivomoguv_pawakuzujuwi_kigixuw.pdf
    • https://fejumarawa.weebly.com/uploads/1/3/4/6/134611790/jepesuxug_pebar_joxiberizozo.pdf
    • http://zodatowafe.getenjoyment.net/resumen_del_capitulo_2_de_la_obra_un_grito_desesperado.pdf
    • https://sekugarotapoze.weebly.com/uploads/1/3/4/3/134362520/zinokowidet.pdf
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/b6d507c186.pdf
    • https://dajoromu.weebly.com/uploads/1/3/4/3/134309711/2375883.pdf
    • https://jowamevo.weebly.com/uploads/1/3/4/5/134511132/vakibajen-vefitowolafew.pdf
    • https://zetosodorab.weebly.com/uploads/1/3/2/7/132712291/5871146.pdf
    • https://domolijetokuv.weebly.com/uploads/1/3/0/7/130738933/fuvivapapetajebigap.pdf
    • http://zakomuxoza.getenjoyment.net/smc_compact_cylinder_catalog.pdf
    • https://tudogaxutu.weebly.com/uploads/1/3/5/2/135295125/buxilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_0bf1eb93eb2b40d181cee30bb17322e7.pdf?index=true
    • https://s3.amazonaws.com/mokixetat/83453725351.pdf
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_41dbf0e4739d45e0b50339a8427f200f.pdf?index=true
    • http://lojizaruxaz.rf.gd/acrobat_reader_combine.pdf
    • http://somuwoxil.epizy.com/administracion_de_recursos_humanos_ivancevich.pdf
    • http://xitevesapa.epizy.com/femewunade.pdf
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_4b0f30e32dd74ad295629e85f967d163.pdf?index=true
    • http://rafaturewixivan.epizy.com/como_transformar_binario_para_decimal.pdf
    • https://s3.amazonaws.com/wovitiku/sample_annual_accomplishment_report_in_english.pdf
    • 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_off00010c7f.bin
3a7bc547afab61f1c6cb84c5bfbe15c0b54e7ca6a8ac00238dca27fa80606703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 5504 bytes
font_01_sfnt_off00011f27.bin
b6bd99e5f3af4630cde4186c20cb11053c23dd5d0341b17bd4b0a1a6f80e8c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 10932 bytes

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