Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc88a9cdb0934d1a…

MALICIOUS

PDF

81.0 KB Created: 2021-03-16 12:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 244ed804ae3a387d6ef3d79a119921f8 SHA-1: 8ece913b0295a828241f1d7c8403248473a03b88 SHA-256: fc88a9cdb0934d1ae518bc3a32181d098a087088ddf5928fd0b841a23c27eb06
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'nipisod.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'auto air conditioner problems'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=auto+air+conditioner+problems
    • https://cdn.sqhk.co/wifavizen/kN06xhb/memasemekawugeduribekevo.pdf
    • https://cdn.sqhk.co/lirebirab/thfigie/98988528617.pdf
    • http://uscovidcharts.com/widenemifejimomumobih0b2.pdf
    • https://cdn.sqhk.co/dopuwene/wVhglhh/big_game_hunter_2012_wii.pdf
    • https://cdn-cms.f-static.net/uploads/4420764/normal_600f5b2e6101a.pdf
    • https://cdn.sqhk.co/nutewakizi/jcGchiv/fetodajerekod.pdf
    • https://cdn.sqhk.co/naxetimi/ggjZRkd/53540514076.pdf
    • https://cdn.sqhk.co/wadalibituge/ahezlWJ/20750492911.pdf
    • https://cdn.sqhk.co/losokifape/J16hegh/school_girl_simulator_mod_apk_1._0_unlocked.pdf
    • https://cdn-cms.f-static.net/uploads/4424951/normal_6018a4556c82f.pdf
    • http://nuverlites.online/privilege_power_and_difference_chapter_5_summaryy1dcg.pdf
    • https://cdn.sqhk.co/matajikiwov/dhek7gc/sojolupuxufapesofoximu.pdf
    • https://static.s123-cdn-static.com/uploads/4410016/normal_5ffba215e3205.pdf
    • https://cdn.sqhk.co/lusimalifa/hhgii8V/chex_quest_hd_characters.pdf
    • http://jewlgems.com/kafujarugelivejm3n2.pdf
    • https://cdn.sqhk.co/jogeguzotire/gfijogi/post_it_sticky_notes_for_windows_10.pdf
    • https://cdn-cms.f-static.net/uploads/4483103/normal_6041345da4299.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zifemibenuf.epizy.com/73039845978.pdf
    • https://uploads.strikinglycdn.com/files/c263776f-3fb6-4d15-8c7d-e54c6211008e/24645178073.pdf
    • https://uploads.strikinglycdn.com/files/28089b39-19f4-4b06-bbd8-7eb3c4f3867c/60139328679.pdf
    • https://uploads.strikinglycdn.com/files/6f4a07cd-f7ab-459f-9f2e-23a6968cd60c/likafosurubog.pdf
    • https://uploads.strikinglycdn.com/files/211f2499-9269-4420-82f3-f483486bdb63/the_game_meaning_name_jason.pdf
    • https://uploads.strikinglycdn.com/files/42ca1951-b3f1-4b51-a72d-7b96017e0764/66089610136.pdf
    • http://jisipisadelotab.epizy.com/appadurai_modernity_at_large.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_off0000fee3.bin
b41b70e6c037975e2ccfd9e3407753d7e1d66303882919f18dcfebec0b0b71a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 5348 bytes
font_01_sfnt_off000110eb.bin
d77feeb27e766da22e268eae5ab1b9ff41dc88136d929bb2fedc845f5a97aa4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 11044 bytes

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