Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab0d2bc573b9a8d…

MALICIOUS

PDF

108.0 KB Created: 2021-01-28 10:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 238ce89cd23e46251800694a579be686 SHA-1: 4282dc7bbf743b9994a454f816c2d92604173a5a SHA-256: 5ab0d2bc573b9a8d71a13557dff906356998b5c5f7b5c22a6fd19243a273b4a4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous embedded URLs, with several pointing to potentially malicious domains like 'bologen.ru' and 'cdn.sqhk.co'. The document body, though heavily obfuscated, suggests a lure related to 'Android wear os watches 2019'. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wb?keyword=android%20wear%20os%20watches%202019 PDF link annotation
    • https://cdn.sqhk.co/sewadokoka/aeifhdE/80396389525.pdfIn PDF document text
    • http://detonic-official.website/711706231237ij1f.pdfIn PDF document text
    • https://kuwiliwal.weebly.com/uploads/1/3/1/3/131378779/nawexaputuwovup_tegosidegi.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/hivyljh/45288852425.pdfIn PDF document text
    • http://detonic-official.website/mobile_kitchen_rental_torontodl1bz.pdfIn PDF document text
    • http://ita-bio.space/fuzatebavisagizaxaz1xv0z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5ff88da1946ea.pdfIn PDF document text
    • https://rivepolimuf.weebly.com/uploads/1/3/0/8/130813401/nujulokowobu_safobofaweladep_kazawat_korager.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vazorilumi.epizy.com/chocolatier_2_free_full_version.pdfIn PDF document text
    • http://jiporiri.rf.gd/jual_mesin_dough_sheeter_bekas.pdfIn PDF document text
    • http://vurasoda.rf.gd/old_agneepath_1990_movie_free_mp4.pdfIn PDF document text
    • http://guzedero.rf.gd/eradicate_crossword_answer.pdfIn PDF document text
    • http://xetoluwe.epizy.com/chevrolet_orlando_2012_owners_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B47 5556 bytes
SHA-256: 2b980e6c00a6fa386a3c08815b844cce318a4f747740d5afdc3b2b6707602013
font_01_sfnt_off00015e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E30 1700 bytes
SHA-256: 2627a98111ec5000f030f634855dead58eb057c962f3cf9c49a3e77aec2b83a2
font_02_sfnt_off000166b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B1 11172 bytes
SHA-256: 5b93018f96e26d4bb538e7b03a5925c73dfc726993024b19131a33b1e75c9aff
font_03_sfnt_off00018cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CDA 16148 bytes
SHA-256: d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f

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