Malicious PDF — malware analysis report

Static analysis result for SHA-256 caccb4e150129dcf…

MALICIOUS

PDF

75.1 KB Created: 2021-06-01 12:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b48072ab26a162ec671bdf5b63c7b8f9 SHA-1: 6afc128154ae30ece8e56ca4c9134bda7cddcea7 SHA-256: caccb4e150129dcfbee9c21cfb676279e6b5fcadd312499092c0287962abfe18
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'crysiq.ru', which is likely a phishing site designed to trick users. The document body, though heavily obfuscated, suggests a lure related to language course materials, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/pbw?utm_term=menschen+a1.2+kursbuch+pdf+answers
    • https://velulaganivuvoj.weebly.com/uploads/1/3/4/4/134438708/xazumorotudovux.pdf
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/5541863.pdf
    • https://xamuzufoka.weebly.com/uploads/1/3/4/8/134893590/321218.pdf
    • https://cdn-cms.f-static.net/uploads/4458389/normal_60461cca72368.pdf
    • https://fuwefojogimoro.weebly.com/uploads/1/3/4/3/134339806/9996072.pdf
    • https://cdn-cms.f-static.net/uploads/4486745/normal_603974ec11185.pdf
    • https://sagojuxejuzogug.weebly.com/uploads/1/3/4/5/134598596/84e9e0392561f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ziduzobif.pbworks.com/f/95841272947.pdf
    • https://uploads.strikinglycdn.com/files/69ab0e6f-40d6-4f1c-baf0-76178c442ff1/74641164341.pdf
    • http://volikedejefa.pbworks.com/w/file/fetch/144421242/castles_and_crusades_players_handbook.pdf
    • http://gitefov.pbworks.com/f/human_body_worksheet_year_6.pdf
    • http://finebov.pbworks.com/f/gunoju.pdf
    • http://sijomirurefi.pbworks.com/f/86183297022.pdf
    • http://jopamedet.pbworks.com/f/aptoide_9.2_0.0_download_apk_for_android_old_version.pdf
    • https://uploads.strikinglycdn.com/files/8b5061da-629c-47a0-aaed-56a53883a8f5/tp_link_wr841n_router_as_repeater.pdf
    • https://uploads.strikinglycdn.com/files/d700c418-199d-4faf-a691-bd9feb492369/student_personal_information_form_doc.pdf
    • https://uploads.strikinglycdn.com/files/e6d30004-e179-4778-8974-7c8c1dc13bf8/does_cow_milk_have_carrageenan.pdf
    • http://pokuwatosat.pbworks.com/f/clash_royale_hacked_app_ios_download.pdf
    • https://uploads.strikinglycdn.com/files/297d1778-74e9-4c4a-ab5b-f694d7860019/60136796497.pdf
    • https://uploads.strikinglycdn.com/files/973cd743-0e38-4dc9-86c1-604a706f833b/sketch_for_mac_full_version.pdf
    • http://dobifapig.pbworks.com/w/file/fetch/144449412/how_does_scout_describe_mrs_dubose_in_bed.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_off0000d9e1.bin
93e4d2887d5d97f86528199c61fff39164b1f17a3934a0692de176e08ac01ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 5728 bytes
font_01_sfnt_off0000ed85.bin
0f034dca0583b243041a9f0d2fbfd4e87e71fd835161d733901009209b672d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 19416 bytes

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