Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3730fabe2e53a3…

MALICIOUS

PDF

90.5 KB Created: 2021-02-17 19:37:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d8d5e7c053f2439909f8882f3b2a923e SHA-1: 4d7ec8cbfad9d9b523a154e9ee66789c24a22311 SHA-256: 3a3730fabe2e53a3bc9d738640c1d64c3f4196421bd2727bb6d50aeebcb90fb4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, a common tactic for SEO manipulation or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of numerous URLs hosted on disposable domains and link farms suggests a coordinated effort to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/wix?keyword=boxers+and+saints+pdf PDF link annotation
    • https://cdn.sqhk.co/rabataxuvax/ejcaWjg/ncg_cinema_lansing_movie_times.pdfIn PDF document text
    • http://gebomomeza.22web.org/vermintide_2_kerillian_weapons_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/gimowiboxero/jamgdif/idle_theme_park_tycoon_recreation_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wevavagu/cjfuibW/raiders_of_the_north_sea_ios_expansion.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/fghgfib/buvumedufeze.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/8hhiehf/play_sudoku_online_free_hard.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/d4855039b0764f.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/jchcgf6/pofusubuvirasob.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/iehFhgt/wolanu.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/Zmgie88/tinuwiwiv.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/aWgiigl/secret_codes_for_samsung_s8.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/jecgcCu/merge_master_impossible_puzzle_games.pdfIn PDF document text
    • https://kivinogafuwej.weebly.com/uploads/1/3/4/7/134702495/virovuwogunoj.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/JiiPuID/21262623563.pdfIn PDF document text
    • http://degitowexara.iblogger.org/tamasha_full_movie_hdfriday.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/polulovasejo.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/98hedjc/21648877050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puretuwedeva.epizy.com/video_instagram_google_chrome.pdfIn PDF document text
    • http://xiwagopa.epizy.com/call_me_karizma_song.pdfIn PDF document text
    • http://japunulu.rf.gd/greatest_inventions_with_bill_nye_energy_worksheet.pdfIn PDF document text
    • http://buzekarutazobe.rf.gd/today_weather_report_live_location.pdfIn PDF document text
    • http://zapofekeba.rf.gd/bollywood_movies_2018_filmyzilla.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 5120 bytes
SHA-256: a21a78f4d8470be2c596b715938c14138ad3b419c4283f08f988a180f936be54
font_01_sfnt_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 10796 bytes
SHA-256: 490c9f81c83b0b4b92b85c332bdcc0e9fdab87f8594b81d3747485c7c488de48