Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13925844565e1f6…

MALICIOUS

PDF

78.8 KB Created: 2021-02-25 08:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7c6a33364f15fc8c01f15dc780c9a4fc SHA-1: 10bedbab3b3f0bbf723114bed80b2a5c9c5e3ea3 SHA-256: b13925844565e1f6d5b274b482951c8786e6f45ddaca6400701a7cbd0357a1e9
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URL 'https://bologen.ru/strik?utm_term=can+a+single+man+claim+head+of+household' is a primary indicator of malicious intent, likely leading to a phishing or malware download site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=can+a+single+man+claim+head+of+household PDF link annotation
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/2d204db2.pdfIn PDF document text
    • http://tujubiluwanodof.22web.org/aircraft_engine_design_3rd_edition.pdfIn PDF document text
    • http://betmoy56.com/22216291597sizvy.pdfIn PDF document text
    • http://kafikiwamavo.22web.org/kogixutodijovofa.pdfIn PDF document text
    • https://mirexoxufi.weebly.com/uploads/1/3/0/9/130969656/goluxezajomivof.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/gilejusudel.pdfIn PDF document text
    • http://good-production11.site/canon_eos_rebel_xsi_user_manualvsy42.pdfIn PDF document text
    • http://muzolifuvekimew.22web.org/veterakitutonunogorigo.pdfIn PDF document text
    • http://ch-redirect.icu/17839946966h7vk9.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/5857186.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusewijoje.epizy.com/78298237196.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/mejot.pdfIn PDF document text
    • http://tepokubomime.rf.gd/kebanitelefagigalejodi.pdfIn PDF document text
    • http://zivufev.rf.gd/67929996318.pdfIn PDF document text
    • http://bunisanabasa.epizy.com/chroma_key_software_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/whatsapp_for_nokia_e71_2018.pdfIn PDF document text
    • http://xiwabave.rf.gd/what_is_an_action_button_on_a_website.pdfIn PDF document text
    • http://zigozojifipo.epizy.com/96941408790.pdfIn PDF document text
    • http://mogerokefo.epizy.com/how_to_connect_my_sony_tv_to_bluetooth_speaker.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_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 5244 bytes
SHA-256: b173d6e9b947818c218f3d0a27968cd01439aeeb559eeea731e873db5ccac8be
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 11208 bytes
SHA-256: e9116583fb93754fc1d49794e649bea44ec79a1ce0b7309a9be247f24118d5df

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