Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaa270b2dc96ea2…

MALICIOUS

PDF

76.1 KB Created: 2021-03-16 02:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8a92e18d61e2e38a42a30453964d88c SHA-1: e9926f1305a7bcf7c643d5c46c822f9294929b30 SHA-256: fbaa270b2dc96ea2666623234dae09f9d9b8289e3766eec6f685db94d660de01
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/123?utm_term=ignou+date+sheet+2019+june+session
    • http://navevukosuso.mypressonline.com/texas_health_and_safety_code_section_822.013.pdf
    • http://tadajixilatu.scienceontheweb.net/architects_in_pune.pdf
    • http://sarupunojupud.sportsontheweb.net/arbitration_and_conciliation_act_1996_latest.pdf
    • https://cdn.sqhk.co/nipigagavadu/Khgicmx/buwopapemem.pdf
    • http://sozaxesugoj.mywebcommunity.org/82510097741.pdf
    • https://cdn-cms.f-static.net/uploads/4416131/normal_60253a5e07bfd.pdf
    • https://static.s123-cdn-static.com/uploads/4478133/normal_5fed6c35e97da.pdf
    • https://cdn.sqhk.co/xuzuvazol/jgghjfm/digavogoxudubimetofol.pdf
    • https://cdn.sqhk.co/jarebomu/jfjinCv/vonikizijififirebijirax.pdf
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fca63f7e1446.pdf
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5fd6e2ed584c1.pdf
    • http://vevovifox.scienceontheweb.net/generative_adversarial_networks_cookbook.pdf
    • https://cdn.sqhk.co/zadexona/hjib4WB/fist_of_the_north_star_game_voice_actors.pdf
    • http://gewusoluxul.scienceontheweb.net/what_is_the_five_factor_theory_in_psychology.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zirururifikelo.epizy.com/in_the_heart_of_the_sea_book_movie.pdf
    • http://nodonukebonona.epizy.com/how_to_model_operational_risk.pdf
    • https://uploads.strikinglycdn.com/files/67c1c2d5-b3fc-45ae-b167-a24324f74cec/63082144086.pdf
    • http://tujefozumuresul.epizy.com/excel_bedingte_formatierung_farbe_von_zelle_bernehmen.pdf
    • https://uploads.strikinglycdn.com/files/e7e727e2-5c7e-479b-9f39-43f05f6858b3/how_to_update_dj_serato.pdf
    • https://uploads.strikinglycdn.com/files/20bb0729-f894-47b6-ad91-7cebd858c3b9/25755359020.pdf
    • https://uploads.strikinglycdn.com/files/0d3df807-0cff-4de8-bd12-daee918b9e2a/3933250280.pdf
    • http://revodez.myartsonline.com/78596761217.pdf
    • http://kezaforow.epizy.com/aashiqui_2_video_hd_songs_free.pdf
    • https://uploads.strikinglycdn.com/files/76576133-7c0c-4b78-8b74-889dae2cab12/what_are_the_benefits_of_stock_investing.pdf
    • http://vexolofifete.atwebpages.com/mobopilujozafinutaj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae5.bin
46bf4ced391c6a697198c3eae1358cb1d7cf38243b825007a29c72dcdd1b1f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 5456 bytes
font_01_sfnt_off0000fd7c.bin
6ca668a078c3c32cc8024aaf6bbd02eaaf9b4ea3f89dbec6ee1fbeaa0606eb88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 10940 bytes

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