Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b97b000e2f750f7…

MALICIOUS

PDF

89.4 KB Created: 2021-03-12 10:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd276a47451a2c00144dce4aeab5cbb4 SHA-1: 1f9461c69ebf06d578f635be650038ce5b7d123a SHA-256: 4b97b000e2f750f7a9f4549daf15ab40891f734c30f45fcac28e37cdd0cb4b42
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or SEO poisoning tactic to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the PDF may be a precursor to downloading a password-protected archive, a common technique to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zajinet.ru/award?keyword=life+cycle+of+amoebiasis+pdf
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/masala_difokesenigot.pdf
    • http://gekodejevotug.medianewsonline.com/35538446012.pdf
    • https://mufanujirube.weebly.com/uploads/1/3/5/3/135348440/7022955.pdf
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/8d39ed48.pdf
    • https://cdn.sqhk.co/puvegipuros/JFL5Chg/tip_top_lawn_care_walpole_nh.pdf
    • https://cdn.sqhk.co/wenegifuteg/8ic1egg/agario_unblocked_funny_mods_play_agario_private_server.pdf
    • http://tizadejaso.getenjoyment.net/30488863690.pdf
    • http://rawoxaxevog.mygamesonline.org/a_song_of_ice_and_fire_in_chronological_order.pdf
    • https://cdn.sqhk.co/pizokifuxe/aij8jj1/15294029420.pdf
    • http://zitupow.medianewsonline.com/can_you_feel_the_love_tonight_piano_accompaniment.pdf
    • https://vusutiti.weebly.com/uploads/1/3/4/7/134762674/04f22d898264132.pdf
    • http://sijubuwejipamun.mywebcommunity.org/zibedopufopimuzep.pdf
    • https://cdn.sqhk.co/girewobo/iggfja4/42557574947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tapexiw/belle_s_beauty_boutique_game.pdf
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_1ba43427fcf940f981e76143b1dc7e22.pdf?index=true
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_7ee4059d17784086a883665ba603b0a4.pdf?index=true
    • https://s3.amazonaws.com/zifozujiwi/89196229851.pdf
    • https://s3.amazonaws.com/juvosi/chloroform_isoamyl_alcohol_role_in_dna_extraction.pdf
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_361e2ddee88f4eeaa0b31905f3167136.pdf?index=true
    • https://s3.amazonaws.com/farefasejikap/formele_brief_schrijven_in_het_engels.pdf
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_dd177608924746f7a908ab144af444f9.pdf?index=true
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_9ca32e6353a44577950653eadc113054.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011300.bin
df88a7af626702a418743a8c6839d94e864d0460c087a7cd7c5c7ba67fcf2fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 4992 bytes
font_01_sfnt_off000123fe.bin
c278ac897be583ce6da656fe37182eb29bcc3bfcf876d7575c45123ec3585e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 11548 bytes
font_02_sfnt_off00014a5b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5B 4324 bytes

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