Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c37af7b3ce25ebc…

MALICIOUS

PDF

76.4 KB Created: 2021-04-19 18:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4fbdfc3ba38954310f9521ab03307aba SHA-1: cad11fdcd4bd1a42c3eac1be72aa93adeca3bfbd SHA-256: 5c37af7b3ce25ebc4dce2066ddec7b75c259bc8ade3bdf23782ea564e86b9f9b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter related to a TV show trailer indicates a social engineering lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=the+lying+game+season+2+trailer PDF link annotation
    • https://cdn.sqhk.co/soxuvezosapa/wtighdf/soxovofaduvanowagururu.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/F5tjfai/3845115068.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/thjFggm/barbershop_2_full_movie_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/Whb48bV/clash_royale_cards_max_star_level.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/hbjjT5i/snow_bros_2_download_android.pdfIn PDF document text
    • http://zekifafeter.scienceontheweb.net/alleluia_sing_to_jesus_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/hgIgdZU/kimixopowazafopaxuz.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/niwekimovonidexaki.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/ib1x879/crush_the_castle_2_pp_walkthrough.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/how_to_be_a_top_student_in_university.pdfIn PDF document text
    • https://cdn.sqhk.co/vufuvevu/Rifhb7i/videjejugipodoli.pdfIn PDF document text
    • https://cdn.sqhk.co/vopirewilofo/auAjdAW/servsafe_food_handler_test.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/sjeNMoG/melody_gardot_tour_2020_uk.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/ganubatebedoxez/javegidilubal.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_6a42697e4c8b471783ebb0b9e48b091a.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_763e7111417844bca099e00e1c2e39e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gebukil/navien_reviews_npe-240a.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/weight_training_meal_plan.pdfIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_60f07b11dda54fb4a90dea28cb8bd5ef.pdf?index=trueIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/craftsman_professional_aluminum_motorcycle_atv_jack_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/what_is_a_2.4_amp_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/analytical_psychology_jung.pdfIn PDF document text
    • http://sulenovigadi.myartsonline.com/bopike.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_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 5280 bytes
SHA-256: 35db310d1eae89e51985c846ebe3ac9cb61a8e53ed95559c7fe65ba5f7a3d848
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 10672 bytes
SHA-256: 847a065def233833b71006238c873136c27b9fc77b2c94dba7456980653f5d2e