Malicious PDF — malware analysis report

Static analysis result for SHA-256 172382adef8384f4…

MALICIOUS

PDF

86.1 KB Created: 2021-02-28 05:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ee2f35cf1f9184dd8ea6964402847dd4 SHA-1: f48907fc8a32c49c23bd1fc9330eeae655e21dba SHA-256: 172382adef8384f4a36e62a84ec2f280cc04c63c3610176e98f430137c6507be
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as part of a link farm. The primary URL, 'https://golowaki.ru/strik?utm_term=how+to+make+a+video+with+pictures+and+music+free+app', is presented in a way that suggests it is a search result, likely to trick users into clicking it. ClamAV detection and ML classification strongly indicate malicious intent, consistent with phishing or malware distribution.

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://golowaki.ru/strik?utm_term=how+to+make+a+video+with+pictures+and+music+free+app PDF link annotation
    • https://cdn.sqhk.co/pefisemise/ghhTggF/99850677694.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/cJidjbj/mighty_party_magic_arena.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/54956866123.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/iiicmib/85613196824.pdfIn PDF document text
    • http://fibokuluzizuse.iblogger.org/36559999689.pdfIn PDF document text
    • https://cdn.sqhk.co/kobedobofepo/mkbIlhj/jibezixofebi.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/lxjiice/kung_fu_panda_warrior_selection.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/famazepigukowifexukuleb.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/how_to_buy_a_convenience_store.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/pudovalofowolege.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xokifanubede.rf.gd/java_swing_button_text_color.pdfIn PDF document text
    • http://zakizil.rf.gd/3rd_person_singular_worksheets.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/the_only_road_book.pdfIn PDF document text
    • http://fububosuvakosal.epizy.com/cat_s_eye_by_margaret_atwood.pdfIn PDF document text
    • http://vuxupib.epizy.com/novekebevemebiruz.pdfIn PDF document text
    • http://newubopuga.epizy.com/dugagosupobati.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/what_kind_of_text_structure_is_a_recipe.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_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 5540 bytes
SHA-256: 1c6ab5f37a289a8b286ad98740787cd2d7bef045e9f049721992911540ffaa7e
font_01_sfnt_off00010f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 10924 bytes
SHA-256: e7377c05e143c83b509b1661d13398bef59c53b71a25aba2b00c97be255ac7a2
font_02_sfnt_off000134b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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