Malicious PDF — malware analysis report

Static analysis result for SHA-256 3591614204a54747…

MALICIOUS

PDF

78.6 KB Created: 2021-03-10 14:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 7287058dcf7c011aa1824567b3b1ec6f SHA-1: 5b280adcd83830dd2267ffd8f7734f4030f95d50 SHA-256: 3591614204a547471b580ae5166eb1b13031f5eba1cd60f5ba8e2d35732e8c44
126 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, with one specifically pointing to 'xajibur.ru/strik' and presented with a 'how to learn art for beginners' UTM term, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan delivery mechanism. No scripts were extracted, but the presence of multiple external links and the document's structure as a link farm point towards an attempt to redirect users to malicious content.

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://xajibur.ru/strik?utm_term=how+to+learn+art+for+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459469/normal_5fd63f551a844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443624/normal_5fe7bc83274b7.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/ihDO84g/nba_2k20_myteam_best_cards_under_50k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_600f66011fc1e.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/Q9gdlCt/53247177949.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/fheagji/barwick_green_sheet_music.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/govoziwodojegimu.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/C2Fqrie/zemed.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/b29c1618-c660-4872-8aa8-28927864a003/master_forge_grill_models.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6dbe1d-1042-4801-8eb8-c57a74d66f58/dasibawakibabakixodum.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/30151507271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83413440-8dd1-4a62-8175-a86ce2408040/lg_g3_vs_g4_vs_g5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96943061-9a20-4fb0-8b54-64f54146cc19/what_is_democracy_quotes.pdfIn PDF document text
    • http://xurolawewetaw.epizy.com/prozac_nation_free_download.pdfIn PDF document text
    • http://vabibago.rf.gd/permission_letter_format_for_college_hod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1794ba2-b22f-4436-8f51-f13944b68ce7/wosevakagilup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc7f630-4b26-4685-b628-66bf3e17babb/41123402079.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/garmin_watch_release_dates_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc26b03-2b26-4c45-a2c4-209d2b9f82f5/78880677048.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_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 5128 bytes
SHA-256: 638486d148a17c20b66afb48aec64e637ec0b186562034bf7dbd9e9eb96dfb8d
font_01_sfnt_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 10500 bytes
SHA-256: b37bc03c9be9a8b970d26582dde2f39aa4994145a23492ac73ca47eb13e072b0

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