Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88584e601d55c80…

MALICIOUS

PDF

121.4 KB Created: 2021-04-23 23:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8964d1c3272500f12c5250976d8c2eaf SHA-1: 50006eee7ac34896afe9bf94c69f1012eed3c034 SHA-256: e88584e601d55c80db37c3c95d89ce37e83a94f0e1391c52f3678fd95da24ac0
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed for phishing, with numerous links to disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially garbled, contains text related to downloading Sims 3 expansion packs, which serves as a lure to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=how+to+download+sims+3+expansion+packs+without+cd
    • http://fejugutafilevin.scienceontheweb.net/75652859775.pdf
    • http://latitekiwa.scienceontheweb.net/24774372626.pdf
    • http://giwitijudaleka.mygamesonline.org/aaalac_program_description.pdf
    • http://xutexukoxobofi.mywebcommunity.org/fairy_tail_anime_characters_female.pdf
    • http://jovasetiveduza.scienceontheweb.net/37420825564.pdf
    • https://mujesazuf.weebly.com/uploads/1/3/2/3/132302915/da9ebd562b58810.pdf
    • http://zekifafeter.scienceontheweb.net/jifasilobupusekufem.pdf
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/3bea5a1.pdf
    • http://lutirojibafap.sportsontheweb.net/memaxiluj.pdf
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/7860196.pdf
    • http://ralugugifoxatir.scienceontheweb.net/bebebuvogafarajob.pdf
    • http://zesegalos.scienceontheweb.net/gagodenogam.pdf
    • http://bosuxezaxad.mypressonline.com/narasimha_kavacham_in_telugu_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vilepobafomunow.atwebpages.com/best_modern_haggadah.pdf
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_ba45cdff6156459aab21deba3665cfec.pdf?index=true
    • http://litorow.myartsonline.com/35827284940.pdf
    • https://s3.amazonaws.com/vuliwisuwig/what_is_the_strongest_intermolecular_force_in_t-butyl_alcohol.pdf
    • https://s3.amazonaws.com/bitizopovopaso/bicycle_thieves_movie_songs.pdf
    • https://s3.amazonaws.com/sorogamat/picsart_apk_mod_old_version.pdf
    • http://fataragoreb.myartsonline.com/14987562348.pdf
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_c9eaf68a9b5a466682ce67f1594197c1.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000184d1.bin
5a411b5146ce9904df859f102f34a4d1d82f623d0d97324d62a987de2594c185
pdf-font-stream PDF embedded font (sfnt) at offset 0x184D1 5568 bytes
font_01_sfnt_off000197ae.bin
c3a31a4b9836c7bd638982e339192d3fba838b98c9580672ea31ee18981d6c9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x197AE 12732 bytes
font_02_sfnt_off0001c2cd.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2CD 16060 bytes