Malicious PDF — malware analysis report

Static analysis result for SHA-256 371a47e1f9f86bbc…

MALICIOUS

PDF

79.7 KB Created: 2021-03-29 03:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dd16328086eae1ea315427ecffa2887 SHA-1: d413e3ff77c8e00cad72b0bfa84ca48f4ef81f52 SHA-256: 371a47e1f9f86bbc43a1e032f89d482dded9543434fe874c2fb3eadd580bf09e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing lure. One of the embedded URIs, https://jacksth.ru/award?keyword=exercices+corrig%25C3%25A9s+les+bascules+pdf, indicates a potential attempt to disguise malicious content as search results or educational material. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

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-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://jacksth.ru/award?keyword=exercices+corrig%25C3%25A9s+les+bascules+pdf
    • https://cdn.sqhk.co/bewewojiwo/KHVTieK/2265564686.pdf
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5fee45cf39408.pdf
    • http://dikerulaba.22web.org/amd_raid_driver_windows_10.pdf
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/9f30c1094.pdf
    • https://cdn.sqhk.co/fekawifen/H7hiLgf/halloween_wallpapers_hd_tumblr.pdf
    • https://cdn.sqhk.co/tebefaravuz/hrhfSgi/61383531464.pdf
    • https://cdn.sqhk.co/xuwifoviwalo/RjaphEm/local_bitcoin_wallet_login.pdf
    • http://puviwaxeraw.22web.org/acrobat_dc_pro_offline.pdf
    • https://cdn-cms.f-static.net/uploads/4426087/normal_605f45bae0603.pdf
    • https://cdn.sqhk.co/vedimurami/hjqxuhf/piwubetobos.pdf
    • https://cdn.sqhk.co/wokupogogote/wEhihgo/nonconformity_transcendentalism_songs.pdf
    • https://tedowinoni.weebly.com/uploads/1/3/5/3/135304389/ecae143026f.pdf
    • https://fevanigazotife.weebly.com/uploads/1/3/4/3/134376534/3491a18d0.pdf
    • https://static.s123-cdn-static.com/uploads/4385424/normal_5ff33f380efb3.pdf
    • https://static.s123-cdn-static.com/uploads/4413705/normal_6007532f18b65.pdf
    • https://cdn.sqhk.co/kodivitedi/fNhiiif/bullet_force_apk_mod_download_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nubopasorafat.rf.gd/calendario_mese_di_dicembre_2020.pdf
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_3fea99c2800c4a839dc0edfd8e404334.pdf?index=true
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_cddd17822def48ebb03e6a2f89d2e308.pdf?index=true
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_e5f2a2be3b754f62ab76f52974560906.pdf?index=true
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_aa128684ce604521bf58600c8680f528.pdf?index=true
    • http://fozufafetad.epizy.com/20963678348.pdf
    • http://femiworuw.rf.gd/how_to_update_verizon_lg_flip_phone_to_computer.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc8.bin
83882bedc3f55b68c86bf715d7ea00a277f31a5b470d12b2d571433ef3bda92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 5632 bytes
font_01_sfnt_off0000f2be.bin
d6d62440b53e1c1c310fbef47f3883c174061bf7600bb6e5948af4bd05e5ac49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 12084 bytes
font_02_sfnt_off000119b3.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 16204 bytes

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