Malicious PDF — malware analysis report

Static analysis result for SHA-256 8faf2304e9be8212…

MALICIOUS

PDF

83.5 KB Created: 2021-03-29 14:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6aa56cda48e14693090e448953222598 SHA-1: ff848a4ecfa9a61d159747fe58a91ed85344ee00 SHA-256: 8faf2304e9be82123b764416f61da81c265852e5b1e4062f21655bf84c96a4cd
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. Multiple external URIs are embedded, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains strings related to 'wkhtmltopdf' and 'design catalogue', reinforcing the lure. No scripts were extracted, but the presence of numerous external links points to a likely attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/award?keyword=double+door+design+catalogue+pdf PDF link annotation
    • http://bewilotaweje.mywebcommunity.org/where_is_the_unloader_valve_on_a_karcher_pressure_washer.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/dogivoni.pdfIn PDF document text
    • https://kumobavogi.weebly.com/uploads/1/3/2/3/132303339/povabi.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/Tjjifwz/48850638269.pdfIn PDF document text
    • https://cdn.sqhk.co/suwefememe/iijdiih/diwisuxapuxebujif.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/6291470.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/difference_between_pedagogy_and_andragogy.pdfIn PDF document text
    • https://kigilejujagenit.weebly.com/uploads/1/3/1/4/131438309/wisetenubo_tavepupog.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/boNgiC3/filuniragopojijuvona.pdfIn PDF document text
    • https://cdn.sqhk.co/wijanotunam/Zr3bgdl/smart_goals_definition.pdfIn PDF document text
    • http://molefomisapeput.mypressonline.com/pakatan_harapan_manifesto_2020_english.pdfIn PDF document text
    • http://fupofejoja.22web.org/nogudafuf.pdfIn PDF document text
    • http://bawilidow.mypressonline.com/all_engineering_drawing_symbols.pdfIn PDF document text
    • https://vuwarudud.weebly.com/uploads/1/3/5/3/135314702/9e4bfef6b.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/JlghhiW/73406636737.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/bewupamulomesodagowimip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lowevuribif.epizy.com/rudomugezumed.pdfIn PDF document text
    • http://sumabaxesopev.rf.gd/module_8_basic_aerodynamics.pdfIn PDF document text
    • http://rixedimuven.epizy.com/vitilif.pdfIn PDF document text
    • http://xajugonagegef.epizy.com/82059027994.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/limits_calculus_examples_and_solutions.pdfIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/arbitration_award.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/operating_system_achyut_godbole_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 5464 bytes
SHA-256: ea0ad9cadaadd714202618b037a9f32523dfa1359fd3fcf2281a87e631ffb04b
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 10316 bytes
SHA-256: a8bbd1b5006b3b466afd9a310e7e1a2bbb029745f025abbe85fc52cea8b2aacf
font_02_sfnt_off00012b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8