Malicious PDF — malware analysis report

Static analysis result for SHA-256 510749bcfc144b70…

MALICIOUS

PDF

86.1 KB Created: 2021-03-16 05:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 62ae0f8b973e5efcc022892d941c16ac SHA-1: 9692afcea1d989250328de92a301d8df0d24f412 SHA-256: 510749bcfc144b70dbefb2ba31aaeed02e9daf288121a77b224125c4ca997b27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/aws?utm_term=how+to+change+samsung+water+filter+da29 PDF link annotation
    • http://kemamibuke.mygamesonline.org/35071793460.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/too_lazy_or_too_lazy.pdfIn PDF document text
    • http://dashcamtopbest.com/asp.net_mvc_5_dropdownlist_from_database62gs8.pdfIn PDF document text
    • http://zelumefepa.sportsontheweb.net/calculus_book_for_bsc.pdfIn PDF document text
    • http://mixit.info/bumisisujunub1o9z.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/dieta_para_aumentar_masa_muscular_hombres.pdfIn PDF document text
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/woluxatewelijax-pakonexip.pdfIn PDF document text
    • http://zabavnyi-slon.ru/motorola_surfboard_sb6141_docsis_3.0_high-speedxp3tw.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/37611174146.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/ULjiQgj/blockchain_wallet_login_forgot_password.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/ibjewja/13176057990.pdfIn PDF document text
    • https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/b0b300b4b189e69.pdfIn PDF document text
    • https://cdn.sqhk.co/bosejadukifo/ThgIqVt/rerabor.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/kidenagizo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogujigasad.onlinewebshop.net/kivadof.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/how_accurate_is_the_16_personality_test.pdfIn PDF document text
    • http://wipibefab.onlinewebshop.net/pitodatal.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/cant_get_pilot_lit_on_gas_fireplace.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/merchant_of_venice_xavier_pinto_workbook_answers_act_1_scene_2.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/agatha_christie_books_online.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/blood_sweat_and_tears_audio_song.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_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 5776 bytes
SHA-256: 70aab1713d06f8a947e11a553491888008d8c9e2b587182d1a432e938ab39d2d
font_01_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 10996 bytes
SHA-256: 1b0bb44c1bb9f533a4d358ae1e64b0caa14e5242c8cfdb30bf2ec83667848c7c

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