Malicious PDF — malware analysis report

Static analysis result for SHA-256 7465187ef26beada…

MALICIOUS

PDF

86.3 KB Created: 2021-03-20 03:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a8c9dad783b88faa15d090c2de080606 SHA-1: 7f25ff4af3256064040ad07eee92a92116c9a6de SHA-256: 7465187ef26beadaf2a1e611669c7a9c3bce24f4933ac6571c3c86b25534088e
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 point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for social engineering.

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://lozipotod.ru/award?keyword=characterization+worksheet+pdf+high+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482625/normal_5fdb9d88ca600.pdfIn PDF document text
    • http://nuvifufaronez.22web.org/78938295525.pdfIn PDF document text
    • http://fotogodopuxet.iblogger.org/deformers_trophy_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_6000e4b173d1a.pdfIn PDF document text
    • https://misodewegakev.weebly.com/uploads/1/3/4/7/134717908/a292289cd3f48cb.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/ljdhcnj/grass_monkey_careers.pdfIn PDF document text
    • https://cdn.sqhk.co/lewewita/gghiMii/bachna_ae_haseeno_song_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_604d5b5daa76a.pdfIn PDF document text
    • http://berezarivire.iblogger.org/wages_board_ordinance_sri_lanka.pdfIn PDF document text
    • https://cdn.sqhk.co/gusijigi/2ij5gek/game_total_conquest_offline_unlimited_money.pdfIn PDF document text
    • http://kisituvowok.22web.org/joseph_prince_sermon_notes_on_communion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_6029707b756e7.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/2b6ff7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_6022eb040c738.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/jBhfZpE/brain_balance_center_san_diego.pdfIn PDF document text
    • http://kafixerutatad.iblogger.org/windows_media_player_for_android_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/best_formal_dress_shops_adelaide.pdfIn PDF document text
    • http://venabot.rf.gd/84133099128.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/gopedelozevaguviluvuze.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/how_to_call_forward_nortel_networks_phone.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 5528 bytes
SHA-256: 2901abe93fd6207dddb794a9d7a133b3cf789b94086c6113c7af5054ea753ac5
font_01_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 11388 bytes
SHA-256: bdf7519ada11050a8c083ac1530619d57c2cded0cf5df89db1371dc5309e5a53

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