Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d82c512d0085e88…

MALICIOUS

PDF

71.9 KB Created: 2021-03-01 03:33:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e0fa3b1bf9b1789cab737140795336c5 SHA-1: 4ef06abe5de9d59e7498a4176286f9d278993744 SHA-256: 5d82c512d0085e88cf5f5c805765e2c17bd895493b0d328fd1410f0511d30f61
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, including one that appears to be a search query redirection, and another that points to a PDF hosted on disposable infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that redirect users to phishing or malware sites. No scripts were extracted from this sample.

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://resalured.ru/wb?keyword=how%20to%20save%20paint%203d%20as%20jpeg PDF link annotation
    • http://predouche.xyz/rca_dvd_home_theatre_system_remotewrsb6.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/nwIhehj/81930778480.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/AoWjejg/kingdom_new_lands_review_gamespot.pdfIn PDF document text
    • http://comp-arenda.site/maya_angelou_poems7eehs.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/hbiahbE/lamixonotadixiza.pdfIn PDF document text
    • http://gudegop.iblogger.org/simplicity_lawn_mower_service.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/gJVHahe/53815040363.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/gqSGcSV/traffic_go_kart_racing_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/iM55Mif/android_messages_download_failed.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/ahhjiKc/maxpreps_5a_football_rankings_alabama_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/Ujahgjf/8012288454.pdfIn PDF document text
    • http://dakijexok.22web.org/talking_tom_2_mod_apk_android_1.pdfIn PDF document text
    • http://netewe8.xyz/fantasia_sevillana_turinaoypro.pdfIn PDF document text
    • http://1green.space/is_the_hobbit_trilogy_worth_watchinglm4pp.pdfIn PDF document text
    • http://eslivdrug.space/dr_martyn_lloyd_jones_romanosx24fl.pdfIn PDF document text
    • http://palitra-cveta.ru/cts_aptitude_questions_and_answersg1033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481662/normal_5fce97c0bf211.pdfIn PDF document text
    • http://swiss-gear.store/ubuntu_bootable_dvd_isojns0i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakilapawunafep.epizy.com/kasuzomepuridekanafaxa.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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 5352 bytes
SHA-256: 1ffd5582b8bad208ceaeaa9fb0b6857e8032ebd0badb9882dbe237aff58a58e7
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 10384 bytes
SHA-256: 5a0366d45e022933c668b8cda1bbfd0636aee55e84b6cc094d905adcc098ed13

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