Malicious PDF — malware analysis report

Static analysis result for SHA-256 421d111d896d79bf…

MALICIOUS

PDF

101.9 KB Created: 2021-03-11 03:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bfc3b7090ada2fe081192ea6f04190dc SHA-1: 284be11b1e050039ef1ef019f99d571af94ee38a SHA-256: 421d111d896d79bf3e5f2237b271b009f450a649adaa1f388fdfc5aabecdf7b5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to `dafemum.ru`. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a phishing or malware distribution attempt, aiming to trick users into visiting malicious sites disguised as PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/strik?utm_term=is+cobra+considered+creditable+coverage+for+medicare In PDF document text
    • https://cdn.sqhk.co/ruwonumatag/ieNjugN/46463012942.pdfIn PDF document text
    • http://ladyso.ru/chuunibyou_light_novel_englishcdj4g.pdfIn PDF document text
    • http://mysteps.online/mubomurenajo4y99r.pdfIn PDF document text
    • http://converstarget.ru/nudokoletoguwinijuteb4ar3q.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/gIidgh5/pixel_car_racer_gtr_r35_best_tune.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/gcuWgds/abcmouse_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/jZoijd1/53091477700.pdfIn PDF document text
    • http://vodoroding.info/devimomebirolilusemrm6hx.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/3thghcY/20294598147.pdfIn PDF document text
    • http://sport-stavki.fun/valediction_by_sherman_alexiesg1wo.pdfIn PDF document text
    • http://loveantravel.xyz/murachs_java_servlets_and_jsp_3rd_editionnci4z.pdfIn PDF document text
    • http://storeplus.pro/365079361362ts7w.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/dowesitobuga/30733251165.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/swamp_thing_2019_episode_3.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/2949649563.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/dajapexifipukenoma.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/linux_bash_loop_through_all_files_in_directory.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/bein_sport_connect_apk_pure.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/microsoft_word_for_mac_price_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/jetubifugiwamenoni.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/s_letter_style_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/guvol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 14372 bytes
SHA-256: a2872fa992b1ad7a46b3e607d0a21cfb86f4fc8713bf32b23adce4af625f9a79
font_01_sfnt_off00014d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D12 5476 bytes
SHA-256: 3d08b4fc4d4a2362efc7a50e67ab70d1ffbe0bb3dd428797d28f43de5489e56e
font_02_sfnt_off00015fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA9 11880 bytes
SHA-256: a84904a8b09cdb9ee1b9b34a16c247f4dbbb11ede339b006c501b6dd898e1b58

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