Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60caaab87ceba68…

MALICIOUS

PDF

77.6 KB Created: 2021-04-28 17:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1329e57f3dfb4f9b8018b700b503360d SHA-1: 994aea1a667c780dc8d890eaf61228bfd6ae478a SHA-256: c60caaab87ceba686c34f14e59a5e781fbef96fb0be9862196a6aabd0bb65874
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The embedded URL 'https://botokaw.ru/strik?utm_term=how+do+i+fix+my+lenovo+battery+not+charging' suggests a lure related to technical support or troubleshooting, aiming to redirect the user to a potentially harmful site. The document body, though heavily obfuscated, contains fragments that align with this phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=how+do+i+fix+my+lenovo+battery+not+charging
    • https://cdn-cms.f-static.net/uploads/4471971/normal_60216a39b6d88.pdf
    • https://cdn-cms.f-static.net/uploads/4420019/normal_6057b29e1eb3d.pdf
    • https://static.s123-cdn-static.com/uploads/4379374/normal_600495db1e826.pdf
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/tamup_sategebimet_vigota_buderuzuzuzu.pdf
    • https://revuduxaj.weebly.com/uploads/1/3/5/3/135333309/wisewupef_koxifowijadaz_musakejuvasure_welanowuseta.pdf
    • https://cdn-cms.f-static.net/uploads/4368976/normal_60654d38d1b36.pdf
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/nuwerukav.pdf
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5ff71b83db397.pdf
    • https://cdn.sqhk.co/milibotobov/Ajbcgio/fomewutenozofito.pdf
    • https://cdn.sqhk.co/retepisej/hemjjYG/sonata_pathetique_free_piano_sheet_music.pdf
    • http://gepanukotex.getenjoyment.net/15709329588.pdf
    • https://pijezokonogoxa.weebly.com/uploads/1/3/4/3/134308979/wugumexisupazoluji.pdf
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/0d0bb.pdf
    • https://cdn.sqhk.co/kizofapekeku/iLjhaji/iot_experiments_using_arduino_uno_and_raspberry_pi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zegiwewezenaro.myartsonline.com/bible_study_guide_kjv.pdf
    • http://tikimiwuwal.myartsonline.com/burglary_in_nigeria.pdf
    • http://wurebosuloxu.myartsonline.com/gijikotutipezare.pdf
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_c665a116ac004819b8652c06ca67524b.pdf?index=true
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_4192ba154a2d46bca36126737a142f9e.pdf?index=true
    • http://tizeruxabono.onlinewebshop.net/6758484541.pdf
    • http://vebusatoro.atwebpages.com/systemverilog_for_verification_a_guide_to_learning_the_testbench_language_features_3rd.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_off0000f1cb.bin
f5c6ae0ec712623c7fe79ccb0e30338eb75e6518e452bdb1ee1543e6a4de0ff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 5680 bytes
font_01_sfnt_off00010518.bin
d05ae4e5cdc078b03ece2e1e5d1745861ad6bdaf3f6071daa100b053190d48af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 10544 bytes

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