Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7bd6b9470553f9…

MALICIOUS

PDF

83.1 KB Created: 2021-04-01 23:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 71b64c8b22c53fada4ddaa0a20d1f456 SHA-1: b28d7c00624f8aeac9715a0eabc2d99a79c14e45 SHA-256: ac7bd6b9470553f95ff6994e5d673384bae499960487806af35ecc5e1ff261b9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/strik?utm_term=subaru+pressure+washer+pump+parts PDF link annotation
    • https://cdn.sqhk.co/xavaxonad/dLjeuhi/free_slots_to_play_online_with_bonus_rounds.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/9ggDOjj/weather_channel_app_premium_multiple_devices.pdfIn PDF document text
    • https://cdn.sqhk.co/rijujonakuje/ggojc9l/dairy_free_lemon_sponge_cake_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/mitulijur/gEIJiew/mosevorosopuse.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/isometric_drawing_symbols.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/4izkJjc/online_marketing_degree_associate_s.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/ehizRjg/dimuditepapavuk.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/tactics_for_listening_1.pdfIn PDF document text
    • http://zufefusu.iblogger.org/how_to_clean_the_shark_navigator_lift_away.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_60148e0cb3dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_60198fee6e5c8.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/jfhf5hb/kotidinevanorenulexu.pdfIn PDF document text
    • https://cdn.sqhk.co/dagedazi/ijfghge/bobby_s_movies_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_601d26edd0fad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaguvigijosev.epizy.com/mini_blast_furnace.pdfIn PDF document text
    • http://sidesapamapa.epizy.com/thyroid_disease_during_pregnancy_guidelines_pocket_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/how_to_estimate_app_development_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/verbal_reasoning_test_11.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/how_to_find_the_slope_and_y_intercept_with_two_points.pdfIn PDF document text
    • http://debagejusuwaj.epizy.com/9980118601.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/2920510685.pdfIn PDF document text
    • http://newewixojarulup.epizy.com/walt_disney_world_calendar_of_events_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/rinetujunebezijovapetatew.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_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 5364 bytes
SHA-256: 01e7c791992d6b694eb4c624cc787a51abbe484596a6f9a5ab86047d98a65216
font_01_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 11252 bytes
SHA-256: 6dd9ce263bbeef268409aba5886092043ae8e4ff929f5faaa3b70b793721ba09

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