Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37c46bdcea30af9…

MALICIOUS

PDF

76.2 KB Created: 2021-02-28 01:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c4c61a6548a6c1426b448ab6a9c9dcd5 SHA-1: a4e9bbabb42d1a0feebcf550911618eea2fb94f2 SHA-256: c37c46bdcea30af9907adebc920d2a27fe8a0c90fa3efc216b4743364a7d5754
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=samsung+model+rf28hmedbbc+manual PDF link annotation
    • http://detonic-buy.website/fovoxupezezijiuqkp2.pdfIn PDF document text
    • https://paguvobidelovug.weebly.com/uploads/1/3/2/8/132815355/dunekezilejege_betowutale_ziruwo_lorumim.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/igjhhe9/planet_fitness_near_me_open_24_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/gghdgii/78391622188.pdfIn PDF document text
    • http://50offshop.pro/facebook_android_desktop_ansicht038ky.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/3a0bf.pdfIn PDF document text
    • http://prolac.ru/2311363034bap27.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/9uTToTb/helicopter_rides_las_vegas_cheap.pdfIn PDF document text
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/rusujek.pdfIn PDF document text
    • http://dagulofevururuk.22web.org/olaudah_equiano_livre.pdfIn PDF document text
    • http://design-kvartira.info/24071702996a94z1.pdfIn PDF document text
    • http://wrestling-mma.com/sinavetogibufewifedaridrstv.pdfIn PDF document text
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/3368587.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/lavutanefavolailooy.pdfIn PDF document text
    • http://qupieasy.online/how_to_lose_weight_on_a_1500_calorie_dietjs2gf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevekesudizare.epizy.com/envelope_system_spreadsheet.pdfIn PDF document text
    • http://wijevisufa.rf.gd/rilafaw.pdfIn PDF document text
    • http://kubuleg.rf.gd/ipad_pro_2018_wallpaper_4k.pdfIn PDF document text
    • http://duzoweserunojoj.epizy.com/application_bfm_tv_android.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_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 6004 bytes
SHA-256: f86fc4ab5c03ce7ec7ac64f550004a2b188a8e763a95e56924065ed69aa748e5
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10764 bytes
SHA-256: f25e7408ac4eacf90a535b77b2cc8f0ba029f617b54a3f8b0d3cb20971c025cd