Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e5328d9901438f…

MALICIOUS

PDF

89.5 KB Created: 2021-04-06 15:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05a5c117f9b5eb06efde309063338ef4 SHA-1: be53782c0665d9afe7139b2380f0da545422bb02 SHA-256: 64e5328d9901438f9e24a199806fa42a8bacbb403db847d32c0262fdb05df765
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to potentially compromised or malicious domains, suggests a phishing or link-farming scheme. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=data+science+projects+with+python+pdf
    • https://cdn.sqhk.co/rifokinimito/ibjegcR/ghosts_of_mars_2001.pdf
    • http://teachersaid.fun/nulovixizipzkpha.pdf
    • https://nivuvibopaxaji.weebly.com/uploads/1/3/4/5/134588818/4357361.pdf
    • https://cdn.sqhk.co/kototokim/xjdEthj/tower_defense_games_cursed_treasure_2.pdf
    • https://cdn.sqhk.co/vasegodesazu/hdl8jhW/blazetv_sign_in.pdf
    • https://memuvarava.weebly.com/uploads/1/3/1/3/131384606/valebazanajuxi.pdf
    • https://cdn.sqhk.co/xonipavu/fyielxF/brawl_stars_free_gems_hack_apk.pdf
    • https://cdn.sqhk.co/gevolonovare/MijgdHh/free_streaming_sports_sites_2020.pdf
    • https://cdn.sqhk.co/ronelejibir/jjjdZHi/45719612164.pdf
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/nusokejadipulo-fanekobituvadaj.pdf
    • https://cdn.sqhk.co/jagakutojut/bXhghep/80022014927.pdf
    • https://cdn.sqhk.co/kaxovugefulo/uT9iigf/tikava.pdf
    • http://lianhua.life/beginning_c_through_game_programming_fourth_edition2b9e5.pdf
    • https://cdn.sqhk.co/xusopusavo/Svww8id/59533669112.pdf
    • http://istra-backwater.ru/wejolodegalidadunopebagud5xyt.pdf
    • http://hardcreditcheck.info/fateru3qbq4.pdf
    • http://gratoram.site/filurimedigizikilabuzid2vdp5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rofuvawitarul.atwebpages.com/beatitudes_list.pdf
    • http://vafitinupisojud.onlinewebshop.net/englisch_aufgaben_zeiten.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ccb.bin
47f472fd82cc32908eff79b6f18dc9a156ff3a5c1dbd0a2f84353fa161ba7c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 5268 bytes
font_01_sfnt_off00011ec0.bin
b563f91f1b0fe421a8e44eb78c2fdba395cfb5e4c7423ae35fe4847013ab440f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 13844 bytes
font_02_sfnt_off00014ab0.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB0 4324 bytes

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