Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cfc571fadef3c4…

MALICIOUS

PDF

69.3 KB Created: 2021-01-26 19:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dbb290e9149e48c033347c4fdfdbfe85 SHA-1: 874ba8f8bcf00041f6e3240d16381ad87b681dc1 SHA-256: 33cfc571fadef3c4680a9b121d24d517aef673c0cf18646cb3ddb9021c96d9e4
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=apk+pure+apk++for+pc PDF link annotation
    • http://instofficial.online/juventus_fc_roster_2020jutjs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5ff84b0f3ac91.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/HdkcgiB/painting_ideas_on_canvas_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/iiRjfid/rumawid.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/nhjZpih/65301957652.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/fShi3ja/hoverboard_repair_store_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390995/normal_5feb2c1db9bf0.pdfIn PDF document text
    • http://3203epworthcres.com/okta_login_csulbuvxis.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/Gc9Thbi/mutant_creatures_mod_1._12_2_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zudoputasafe/jebidhj/epic_games_fortnite_download_ios.pdfIn PDF document text
    • http://befigter.xyz/biderowebolomakinokowag5ou9t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_5fd949797b83b.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/icSgfij/dj_sound_equalizer_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wufakinupo/bgi2Exl/vilivinenuzevegotugitu.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/ghekWhc/labive.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/bqziiAp/ziwafewamomutit.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/hhggggz/begomorik.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/Vjhnhje/38625656619.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/denododogu5yaif.pdfIn PDF document text
    • http://cmb-eco.com/nantucket_lobster_trap_phoenix092i9.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/hg4n8hh/kingdom_nick_jonas_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5fee545f64e93.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_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 4852 bytes
SHA-256: 6a92d1083ace496af45a29e3304d2d05b2075665492c48f9ffb81a17e5aa1471
font_01_sfnt_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 10624 bytes
SHA-256: 957feb78dfd37fbd8a176f3717689caada93181dc0d6f85ec96b05c92a0837df

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