Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f1fc4ec922198e…

MALICIOUS

PDF

77.5 KB Created: 2021-03-30 03:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd2d39951d472b06ef9ff3046a18c642 SHA-1: db2a04ad1f4496a70c43d355cc2c60d8267bd72c SHA-256: 88f1fc4ec922198e671f18395458227f91f5e15eb92e611c7cff616243f623b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external links, with one prominent link pointing to a PDF on 'seumenha.ru' that appears to be part of a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malicious redirection tactics.

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://seumenha.ru/wix?keyword=how+to+feed+as+a+level+4+vampire+skyrim
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/ripajesu.pdf
    • http://asia.kiwi/vufibanigapejodu45fg.pdf
    • http://shortsomfj.space/98441893671p3h0o.pdf
    • http://epaytds.xyz/stealth_camera_app05g8a.pdf
    • https://mulibini.weebly.com/uploads/1/3/4/8/134881685/kutoveboze_tanal_susinor_paziruwuza.pdf
    • https://walafikug.weebly.com/uploads/1/3/2/7/132740659/gozob.pdf
    • http://apelsins.space/wahl_trimmer_battery_745-8000jpu1.pdf
    • http://inglassrus.ru/cheat_sheets_em_portuguesjpo5m.pdf
    • http://mydenverneighborhoods.com/62849018529zxazq.pdf
    • http://4escam-bot.online/warhammer_40k_bookaw3o7.pdf
    • https://sakavikonur.weebly.com/uploads/1/3/4/8/134854141/5637554.pdf
    • http://myluckybet.xyz/dokofoved0w45m.pdf
    • http://ralenexixozuk.iblogger.org/natadumij.pdf
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/xapopivejiv.pdf
    • http://vash-fasad.live/wokojutibijusabaedu2c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fikuvine/vojodawimidiloka.pdf
    • https://s3.amazonaws.com/lanaladu/bright_line_eating.pdf
    • https://s3.amazonaws.com/xufaxoferugod/manual_of_love_2_full_movie_free_download.pdf
    • https://s3.amazonaws.com/jivala/18334723839.pdf
    • https://s3.amazonaws.com/fojaxexino/bas_attendance_software_free.pdf
    • https://s3.amazonaws.com/genedesowul/wadef.pdf
    • http://sibijexobesu.epizy.com/27281015341.pdf
    • https://s3.amazonaws.com/sedowedi/metformin_extended_release_500_mg_side_effects.pdf
    • https://s3.amazonaws.com/dopugaxelelema/funny_cat_sound_ringtone.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_off0000f19d.bin
8546366cc77864b2bed2df70301bccd450575d2a69b6e7e36efc9a7a7053e77b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 5552 bytes
font_01_sfnt_off0001048d.bin
3c01b618eb2579552be523e6833723e481a796e325cbf46bdcae2e091f44c413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 10528 bytes

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