Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d2c53e9415a8eb…

MALICIOUS

PDF

77.5 KB Created: 2021-03-06 10:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cdfb40d2226c68520a8d7f6d853e3a07 SHA-1: cfbdcf76b15491d20a44d248b5db82c67a3e5598 SHA-256: f7d2c53e9415a8eb1ecb48523d4e2ee9b15edab7aff244e2fc5cbd8c48a9178f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious content. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/award?keyword=electrical+engineering+salary+2020 PDF link annotation
    • http://ru-en.xyz/vatudadejo08t31.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/6Igdifo/carnivores_dinosaur_hunter_reborn_pc_game_2015.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/ghyEbdj/dufowejifem.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/dRhiujc/blue_cross_blue_shield_login_alabama.pdfIn PDF document text
    • http://hookup681.site/47984337974b98p2.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/RThibhn/mifap.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/ce1406eebe8f140.pdfIn PDF document text
    • https://bonuwokepav.weebly.com/uploads/1/3/4/5/134592975/f62b40be9337.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/cSYIxGG/75391144563.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/ickidje/download_bubble_shooter_hacked_version.pdfIn PDF document text
    • https://cdn.sqhk.co/regisanozoxo/i4cjh9R/jogo_catch_the_candy_halloween.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/gh4ij8M/war_of_kings_board_game.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/NGicSBI/60482798003.pdfIn PDF document text
    • https://cdn.sqhk.co/lozosasuxe/ifqFSzj/851831006.pdfIn PDF document text
    • https://cdn.sqhk.co/bikulatitaxe/chbhikm/virgin_pulse_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xafogatok/j84wXIa/10_billion_wives_cheats.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/vefukumafera.pdfIn PDF document text
    • https://cdn.sqhk.co/gatuwaven/GijVlia/xewodoxawowunopusir.pdfIn PDF document text
    • http://mx50off.info/examples_of_bloodborne_pathogens_engineering_controlsfxj57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/770921e4-9fd3-46a7-8d58-8fe49d2dac42/la_estructura_del_texto_informativo_es.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8623eb33-ddcd-420d-bd1e-73ebbc9e25a3/does_ikea_sell_replacement_screws.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1effd06-edd2-48f4-998f-9220c2f86ce9/what_size_battery_for_a_craftsman_riding_mower.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 4980 bytes
SHA-256: d71aa4757960d93aa73a54352f8c8f5eba7bf293e3a1004f6bae149611101b8d
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 10444 bytes
SHA-256: 3d8c4382e2750f888f4a52c0bd798fe5107b148ae228098e4838d304c4e9fc55
font_02_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3