Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cf77ff8a7321d6…

MALICIOUS

PDF

74.0 KB Created: 2021-04-03 06:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7668eea4f207aed5f837ccd9ac377d6 SHA-1: 24ee644bee0df6ec541232c99be4265cd4083fa8 SHA-256: 00cf77ff8a7321d639b0806fe652375a0de24de2536188577affa5a379f4c67e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'geometry answers', likely to trick users into clicking malicious links. The presence of multiple external links and the ML classification strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=ucsmp+geometry+answers
    • https://cdn.sqhk.co/benibavagoge/hbSihkQ/42980340863.pdf
    • https://cdn.sqhk.co/vixonafom/hbE0kif/lebetujixufelapuzepad.pdf
    • https://cdn.sqhk.co/pulafefer/qqsHoif/sani_cloth_af3_covid.pdf
    • http://winnerslm.space/86113279470yzo42.pdf
    • http://help-copyrighteamservice.com/516498723983jcin.pdf
    • https://cdn.sqhk.co/darojopul/gkLwJ0F/doremalalupatafenivubok.pdf
    • https://cdn.sqhk.co/dulemokel/Hggiaha/free_bollywood_new_ringtone_2020_download_mp3_dj.pdf
    • https://cdn.sqhk.co/sowanigog/ifjbjfi/beetalk_chat_apk.pdf
    • http://online-bestshop.xyz/51219574082v86db.pdf
    • https://purapunebofo.weebly.com/uploads/1/3/4/8/134888030/nepamagavuwit_munapor_giruwafipe_goguxufaruliwi.pdf
    • https://cdn.sqhk.co/jotenitix/jfBkZia/words_story_game_cheats.pdf
    • https://cdn.sqhk.co/saturarad/ZWyhijh/steamer_clams_white_wine_garlic.pdf
    • https://sisekiki.weebly.com/uploads/1/3/4/6/134622657/5340112.pdf
    • https://tewazaxapij.weebly.com/uploads/1/3/4/8/134873756/vuvotugaf_xapazuxe_salukase_ladokedub.pdf
    • https://cdn.sqhk.co/nisonodoweb/hjdqvhj/zowedole.pdf
    • https://cdn.sqhk.co/xusovatovu/SKhdjbq/todoist_mac_calendar_integration.pdf
    • http://rodsfish.club/rulazj411d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/13338186-6f17-420f-b4e5-dc0bef709283/80576102864.pdf
    • https://uploads.strikinglycdn.com/files/5e1bdda5-37b2-4688-94d7-4a74ce17c64b/57553066491.pdf
    • https://s3.amazonaws.com/pojikovewijeja/kirupuvoxitiwipakugat.pdf
    • https://uploads.strikinglycdn.com/files/c12ad853-157b-460d-9ce3-aba214dfd0cb/taylor_kitchen_scale_manual.pdf
    • https://s3.amazonaws.com/nazekisigiduz/belopujorusi.pdf
    • https://s3.amazonaws.com/bidivo/angry_birds_2_hacked_version_apk.pdf
    • https://s3.amazonaws.com/buganabowumujef/75885200929.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_off0000e21d.bin
790fd870db23b5e1f46a3d9cc3f6b06f2a853a5f0741db85c66a0dc5213f61c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 5404 bytes
font_01_sfnt_off0000f482.bin
4fed969237fb333a52c348769556d2eba3572a1ed7b8ed137da49a5148603bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 11224 bytes

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