Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13493f179932911…

MALICIOUS

PDF

73.8 KB Created: 2021-04-30 23:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f27d954f77e90cb97620cadc556c6ece SHA-1: 2562a6c8f1480b477a5a9bdb52fd900e5a8346bc SHA-256: d13493f179932911a121865fdc3820a75bd310b5e680bfd783a540add19850bd
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains a large number of embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of URLs like 'https://jacksth.ru/strik?utm_term=uniden+powermax+5.8+tru+8866+manual' indicates a lure, possibly related to product manuals, to direct users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=uniden+powermax+5.8+tru+8866+manual PDF link annotation
    • https://cdn.sqhk.co/vedimurami/hatDiii/super_worldbox_sandbox.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://construt.site/behold_a_pale_horse_movie36vke.pdfIn PDF document text
    • http://gazizelasama.getenjoyment.net/zekesojodo.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/gilora.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/tilera.pdfIn PDF document text
    • http://handler-autoscout24.com/kenwood_tm-d710_user_manualyn7mv.pdfIn PDF document text
    • http://wgathering.org/40063671140pybxq.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/kelitixasakoguj.pdfIn PDF document text
    • https://cdn.sqhk.co/velizovatim/jiifhbX/stickman_backflip_killer_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c171f313-255c-4bca-9001-a8e416af7323/febisesupeturogovesevigil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351547c9-2250-4ab4-abd9-4edfc2e5b0fa/kreepy_krauly_automatic_inground_pool_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64b6725-140a-4fda-9737-14a97b5648b1/zazebixozuselu.pdfIn PDF document text
    • http://bepolujogox.atwebpages.com/thermo_king_apu_memphis_tn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deaf62f1-2035-4352-98a4-660efa71121d/a_christmas_carol_by_charles_dickens_characters.pdfIn PDF document text
    • http://jotudokizer.onlinewebshop.net/9571580641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b37313f-7f07-4cf6-a259-47c070db6ab5/five_nights_at_freddys_game_unblocked_4.pdfIn PDF document text
    • http://xepuzakudera.atwebpages.com/wheres_waldo_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12cc4b7b-280b-4b3e-8191-2d7a858b6027/nafuxegosupeg.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_off0000cb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 5584 bytes
SHA-256: c6315d11dfa9a9d61bb74fa874a6c133ea2ae6abb485ebfd8a425db7194045aa
font_01_sfnt_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 11308 bytes
SHA-256: 2fefc3e4a2b230d4c2585c73f1e32304c0c59d29933ee64d9b3f1dbc87250c92
font_02_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e