Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97d347d18d40b47…

MALICIOUS

PDF

88.9 KB Created: 2021-03-12 04:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: aad9d6239e2873e49c3dba32bb3311aa SHA-1: 9922d1f8c382278a1accdba934083d4405bfdf92 SHA-256: d97d347d18d40b4741228dfad1b13be193602694f7fb237ab97b26666a5adfa3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to PDF and potentially misleading titles, further supporting the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=bending+moment+basics+pdf PDF link annotation
    • http://vijufik.iblogger.org/43244877276.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/90906284704.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/graco_snugride_30_user_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_6017792ca2254.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/i2pUUje/music_volume_eq_apk_old_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_6032111403f6f.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/jj4gjnw/hero_tournament_super_stick_saga_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wetedezowob.rf.gd/konokomutajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/059441b3-2652-4713-920f-e3e2868eae44/how_to_attach_chicco_car_seat_to_bob_stroller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b74b480-6643-4995-9812-567b3108fc5b/61596049900.pdfIn PDF document text
    • http://kajufikuxididon.rf.gd/roberixukupekodotevesez.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/nexejawili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1aa683-cb8a-4e71-b6ce-002580318204/samsung_top_loader_washing_machine_tub_clean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a9aeef-8562-4b00-96ac-491165d2060a/how_much_is_my_subaru_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/zebezepe.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/auto_tapper_android_5._1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8a3169-a413-4526-8647-d623f313866d/midland_x_talker_t20x4_manual.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/gigefidebusexunasu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 5536 bytes
SHA-256: 41c4386ecdbedb5a84d46a000bf955b21ab204bc1188863084bf1cc31e601010
font_01_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 11708 bytes
SHA-256: 97bc987cfc19d3f35eaeeff00153eb98f6a9ae21c22247a85555ab702340a7fc
font_02_sfnt_off000141f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F2 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c

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