Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c52079ea4bfff8…

MALICIOUS

PDF

75.1 KB Created: 2021-04-30 04:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8c356e9feb67505853b1e5fdab37ad1 SHA-1: 5005b94e63c5ef65c77b90a0e005c5badb6aeeb9 SHA-256: 28c52079ea4bfff80321cdb02d70ffe65c5d30296e9b373a71821f05c5525aae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, indicative of a link farm designed to manipulate search engine results and direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ponafet.ru/strik?utm_term=music+notes+chart+piano
    • http://mosomupusafebin.medianewsonline.com/dulatafopufefivosawedunu.pdf
    • http://milatepe.medianewsonline.com/kptcl_recruitment_2020_19_notification.pdf
    • https://cdn.sqhk.co/felinavaw/bbCnjjS/fun_coordinate_plane_worksheets.pdf
    • https://cdn.sqhk.co/dufubimaru/lf9ghja/39810250623.pdf
    • https://sedarujewajoto.weebly.com/uploads/1/3/0/9/130968957/77f4add35816.pdf
    • https://wumupokurura.weebly.com/uploads/1/3/0/7/130776197/fivogilujetasum.pdf
    • https://cdn.sqhk.co/kedetofido/2Cgghbv/starlink_beta_sign_up.pdf
    • http://jiwapadenejeza.getenjoyment.net/witogiziv.pdf
    • https://tivirubopif.weebly.com/uploads/1/3/1/4/131406506/3456897.pdf
    • https://cdn.sqhk.co/zepipawetopi/ghf3Vhh/guidestone_financial_employer_login.pdf
    • https://cdn.sqhk.co/sofizagumup/Qjib5ig/ponowozelum.pdf
    • https://cdn.sqhk.co/vizinifum/dgihaSP/talking_cartoon_maker_app.pdf
    • https://cdn.sqhk.co/kisasizaro/giXjjSL/cheetah_running_full_speed_hunting.pdf
    • https://cdn.sqhk.co/vinogusi/Ihdggn7/monsters_with_attitude_online_smash_brawl_pvp.pdf
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/3022cf000398729.pdf
    • https://cdn.sqhk.co/zuvomafoda/gjfhjbd/minecraft_egg_wars_server_turk.pdf
    • https://cdn.sqhk.co/lovojekaboxi/ahabjfU/royal_caribbean_international_jobs.pdf
    • http://rakadan.sportsontheweb.net/lire_journal_echourouk_algrie_d_aujourd_hui.pdf
    • https://cdn.sqhk.co/badilapo/nBwiig1/13294132095.pdf
    • https://cdn.sqhk.co/kibutonap/xgihjhi/mavel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bopubedoru.myartsonline.com/xaxesu.pdf
    • http://jujobope.atwebpages.com/memoria_de_mis_putas_tristes_book.pdf
    • http://torejejowomu.myartsonline.com/49115886713.pdf
    • http://rivenoke.onlinewebshop.net/hp_laserjet_p1006_printer_driver_for_windows_10_64_bit.pdf
    • http://vupaguriwedizid.atwebpages.com/program_nitro_to_word.pdf
    • http://defakulid.atwebpages.com/mojoputasokubowilulefer.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_off0000e95e.bin
11236b78f60fc0eda0e20d2829dc08460eb6dc91db485ca4e66cf6a1cc683c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 4996 bytes
font_01_sfnt_off0000fa60.bin
8f4a1b373534221debf261eb2465b05b98a590e7e69d350d6e309929e0c29265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 10692 bytes

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