Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e31d9759a4cdbda…

MALICIOUS

PDF

70.0 KB Created: 2021-02-09 05:21:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 10aa984eb330ac4e9121134376196716 SHA-1: 425464af2ab3b9a4a898ff083c3ab13f7a27e9b7 SHA-256: 3e31d9759a4cdbdad8ffd870889116e38045173b10c65d29e8c0e482bd81f4a5
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/aws?utm_term=big+fish+and+begonia+english+dub PDF link annotation
    • https://cdn.sqhk.co/dokukavifig/Z7gi0gG/11446558513.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/hagehhN/56868766042.pdfIn PDF document text
    • http://perevod24-card2card.site/lobafasovonojubixiv75ei.pdfIn PDF document text
    • https://cdn.sqhk.co/xetorexevapi/54kjiI4/ringtone_rock_music.pdfIn PDF document text
    • http://lessonsonline.site/number_4_worksheets_free_printableh5c70.pdfIn PDF document text
    • http://evatopshop.xyz/cheats_blood_omen_2_pcdo8cs.pdfIn PDF document text
    • http://namedaun.fun/bartter_syndrome_treatment_guidelinesblxch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403543/normal_5fe513803ccda.pdfIn PDF document text
    • http://alania365.ru/lilubazeziwavatasuromekizxtstj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5ff1ed55f0a9c.pdfIn PDF document text
    • http://todayshop.website/5458715944h50im.pdfIn PDF document text
    • http://beremoter.online/fall_guys_unblocked_games_696902he6.pdfIn PDF document text
    • http://8bitbeardsco.com/jemerulovqhl1.pdfIn PDF document text
    • http://brandframeb.com/53661352367m1psy.pdfIn PDF document text
    • http://pl50off.info/toon_blast_champions_league_stage_140yt9sq.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/gg7ngib/jump_zombie_chapter_2_password.pdfIn PDF document text
    • http://ionatr.space/324476668795wodg.pdfIn PDF document text
    • http://world-wild-shop.com/692982523464n6xf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 5264 bytes
SHA-256: de0108716263c80f8caec6b43bd541d31b897599e45aab4550c85aea95f4d168
font_01_sfnt_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 10848 bytes
SHA-256: c9cb8a88f7404f06fa694427088407e57d566dd56d44a175bdc5f66cf9c3091b