Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc608ea5fc79528…

MALICIOUS

PDF

82.9 KB Created: 2021-04-23 08:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1b7700f0080d74922a56ec259fbf786 SHA-1: 2d8df5df830222da81be0e468d07c5a31f8636af SHA-256: 1dc608ea5fc79528948e9b67f8a0e71c317a720e197705879205740cd88b6a06
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'resalured.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a tactic to obscure the true malicious destination. Although no scripts were explicitly extracted, the presence of embedded URIs and the overall detection profile strongly suggest this PDF is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://resalured.ru/strik?utm_term=docker+cli+linux+download
    • https://cdn.sqhk.co/figakeves/KmR8jdU/nojarotolewujagod.pdf
    • http://firstdoctor.xyz/124057825770zkzq.pdf
    • https://cdn.sqhk.co/semiwewedazi/jf1iiji/xatapetot.pdf
    • http://nickned.me/2394152495n054g.pdf
    • http://tumbaa.space/pioneer_apron_pattern_freeso9yw.pdf
    • https://cdn-cms.f-static.net/uploads/4369802/normal_600d87f246a9f.pdf
    • http://garantiya62.ru/canon_mp190_printer_driver_for_macydf7e.pdf
    • https://cdn.sqhk.co/votezevon/ejihdyU/sepiruvenirebesu.pdf
    • https://cdn.sqhk.co/kosifodalab/6TheCih/gmail_sign_in_android.pdf
    • https://cdn.sqhk.co/dapubebireba/6BRujii/riders_on_the_storm_the_doors_concerto.pdf
    • http://dream-stat.ru/pete_the_cat_missing_buttons_gameo420d.pdf
    • http://believes.space/3958634525c19vp.pdf
    • http://nakanilo.club/17747196570h6sbp.pdf
    • http://gerda-msk.ru/how_much_do_pipe_welders_get_paidtr52i.pdf
    • http://jobs-ingenieur.best/22675424602hme0p.pdf
    • http://xekuluw.iblogger.org/amtrak_train_schedules.pdf
    • https://cdn-cms.f-static.net/uploads/4421959/normal_60668d32df92e.pdf
    • https://cdn-cms.f-static.net/uploads/4455898/normal_6043141c89c7b.pdf
    • http://deine-gabe.com/69405053674szjq8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://judejelalub.rf.gd/70163384104.pdf
    • https://s3.amazonaws.com/jemisajoda/designs_for_ppt_slides.pdf
    • http://gipuzasidu.rf.gd/260_drum_machine_patterns_by_hal_leonard.pdf
    • https://s3.amazonaws.com/jodabiladezot/saffire_pro_40_win_10.pdf
    • http://semisoriguregix.epizy.com/recette_par_quoi_remplacer_le_cognac.pdf
    • http://sipesazupijeb.epizy.com/73627440740.pdf
    • https://s3.amazonaws.com/gebukil/jodi_picoult_leaving_time_summary.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_off0001048e.bin
023c46c899426c4bfb55a150f3c01d5e3e4c5c3ab55aa70b5fac463f52b269ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 4980 bytes
font_01_sfnt_off000115aa.bin
ac792d858d9c7cdd11868604f0ad21aa5c8c50af5494c60b56e61cbb07852365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 11724 bytes

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