Malicious PDF — malware analysis report

Static analysis result for SHA-256 7774abf8368d9346…

MALICIOUS

PDF

96.8 KB Created: 2021-03-20 19:49:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 66f89f36cf7064eebaee6a69a959d477 SHA-1: 2f03a2546e3b9c672589060a0e1b8240dbec946f SHA-256: 7774abf8368d93462e889fe967d132a09999251c17aa0af91f198490d548b855
126 Risk Score

Malware Insights

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

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a non-clustered link farm on disposable hosting, further supporting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vilenefex.ru/strik?utm_term=the+second+great+awakening+was+characterized+by+which+of+the+following PDF link annotation
    • https://cdn.sqhk.co/wuxaguzifep/bM2S8ib/lannister_words_game_of_thrones.pdfIn PDF document text
    • https://madoguwulivusi.weebly.com/uploads/1/3/0/7/130775056/5302529.pdfIn PDF document text
    • http://wativeb.mypressonline.com/mixofakuninubabakudofadi.pdfIn PDF document text
    • http://jakiduve.scienceontheweb.net/fiwubasazatojoxunabikazaf.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/dealing_with_an_emotionally_distant_mother.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/javascript_base64_to_blob.pdfIn PDF document text
    • https://ziwupaxibupava.weebly.com/uploads/1/3/4/3/134379030/9001366.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/eVUr6ie/flipper_3d_pinball_space_cadet_game.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/what_does_it_mean_to_seek_the_kingdom_of_god_first.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/katawa_shoujo_hanako_route.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/ehbjg3z/adventure_landing_mini_golf_raleigh.pdfIn PDF document text
    • http://tebogekememesij.mygamesonline.org/who_is_boxer_in_animal_farm_in_real_life.pdfIn PDF document text
    • http://golixudib.mypressonline.com/boxer_shorts_sewing_pattern.pdfIn PDF document text
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/jixefikimipa_suvev_ruxoxubar.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/wepokuluxodixe_duzakepu.pdfIn PDF document text
    • https://cdn.sqhk.co/ludafojebi/NnhiSgh/1521129854.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/xinux-memujugop-kaxawokug.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/PhijaVy/rorigoginisozivapojodar.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/awg_to_mm_conversion_table.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/what_the_bible_says_about_time_wasting.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/62175341867.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/21870804874.pdfIn PDF document text
    • http://jagomizaf.atwebpages.com/16950148658.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/43115483650.pdfIn PDF document text
    • http://duvodix.myartsonline.com/gewuzukebizanaf.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/complex_number_in_standard_form_definition.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/jigulixuvapesobejuj.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/toddler_bed_flannel_sheet_sets.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/misujegebowikoxonejiwivaj.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_off00013ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DED 5680 bytes
SHA-256: 39d9e92e4394bbeacf42e510a0a28c5dc69084cb5cc6b4dc9506300326c58a62
font_01_sfnt_off00015159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15159 10348 bytes
SHA-256: 3df48c6862a0949123462129c5e7bd3d517bf24666e4562c6a8ad3ca3989f145