Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5df137c0abebaa1…

MALICIOUS

PDF

70.5 KB Created: 2021-03-06 11:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3c45858ed2fd0ce2038d2d413fe29ebd SHA-1: 43fe4e853564c2acf56eab4b66a795e2c2bb3c6b SHA-256: f5df137c0abebaa185faa41e8840aee03985d93ab671c79c3e12f7de78d0e240
186 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 a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary URL, https://midufefew.ru/strik?utm_term=video+conferencing+meeting+etiquette, is likely the initial lure, directing users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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=video+conferencing+meeting+etiquette PDF link annotation
    • https://cdn.sqhk.co/wiwokosokif/DKicPja/loud_volume_booster_for_speakers_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/yidij2p/24787519133.pdfIn PDF document text
    • http://stonersfranchise.com/fuvinorneq3.pdfIn PDF document text
    • http://buvepanakupa.22web.org/14198427336.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/ejdJCNB/64092039430.pdfIn PDF document text
    • http://bestcreditcheck.info/amendolara_formaggi_piacenza5dltj.pdfIn PDF document text
    • http://krepezh.guru/300622602o5so8.pdfIn PDF document text
    • http://chambrehub.xyz/77204644670iniok.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/i3rZEXS/97852793589.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/hcgcgfB/last_one_standing_lyrics_webbie.pdfIn PDF document text
    • http://dixurujisefumet.22web.org/72006906295.pdfIn PDF document text
    • https://cdn.sqhk.co/niwexifa/djaq0LC/bein_sports_directv_what_channel.pdfIn PDF document text
    • http://ropilelerenub.iblogger.org/16035659895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffcdf60-9d66-4443-826c-92ed23c1144e/71143383735.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_ccfc3a5122444bd89c966f6f536d3f7d.pdf?index=trueIn PDF document text
    • http://nunusama.rf.gd/balu_abcdefg_hd_video_songs_free.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_54beacb11ae8490ab29fb32d9bd6d7f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3b33a9-e75d-4226-ae08-fed372808948/how_to_say_lenin_in_russian.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_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 5012 bytes
SHA-256: 126706d7ef65bc8fe78cfa9e4dafd4fa0303bd0ae0d1db4d801122f1c7525299
font_01_sfnt_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 10088 bytes
SHA-256: 3b5bcc6f3f5e22a7ad16453a287d7482568858103d480be0962cdae4214fbeff

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