Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ab42e2e6836f04…

MALICIOUS

PDF

77.2 KB Created: 2021-04-13 20:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1575527edcde0368abc49eb772de6ce5 SHA-1: fdc437955f9efa8e398e4683058104e8079927d9 SHA-256: 74ab42e2e6836f044664646d4b6b85ecd50a4080e915032d0df66a96ee295f8c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL 'https://midufefew.ru/strik?utm_term=rain+dial+programming' is a primary indicator of the redirection target.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://midufefew.ru/strik?utm_term=rain+dial+programming PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488837/normal_604b60f14671e.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/ghhchgc/foroperodamud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491946/normal_6064dabbb6336.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/jgcBWDv/26239050690.pdfIn PDF document text
    • https://cdn.sqhk.co/pujunuzivas/3giGhes/best_android_bloatware_removal_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_60699dea55d42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406454/normal_5ff79bbc0b5ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_605d901034620.pdfIn PDF document text
    • http://sivolejujivozul.scienceontheweb.net/56630805974.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/gZjb7ib/android_music_audiobook_player.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/8geCbgc/telegram_and_gazette_sports.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/92213029459.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/iahgi1d/sedalazogirawe.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/MohijLs/26100120395.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/97679755920.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_e4c012d21a4e4063b008352fc9dca29c.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_6ac1b9c6ef9d44c19a54a92ad2fe5086.pdf?index=trueIn PDF document text
    • http://jifimurosesapu.atwebpages.com/wetherspoons_menu_breakfast.pdfIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_8e3d9b05f15b4f8386dceee2f4f57ff2.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_61e9c13eff614320a27d980bbc1824c3.pdf?index=trueIn 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_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 5108 bytes
SHA-256: 3148916212d33aadd0020326cb3e31065f56cb1cf3c891b23b2c0ca79977793a
font_01_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 11312 bytes
SHA-256: ea41b3418249b01a08af6d77278eebd9d04ea5aee4fe167e0aa24ccf99fb242f

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