Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40d6332cef336f0…

MALICIOUS

PDF

87.8 KB Created: 2021-03-22 18:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1bbdd814ff136ff52bccfdef8c4dbd8e SHA-1: 09f9c73d6aa69eb77cf6cbed6384c587fba26635 SHA-256: f40d6332cef336f0609a333a9d257038b5828788b1a814a3a91da4c97e1f9525
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to reference a worksheet, a common lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=bill+nye+biodiversity+worksheet+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/tabafopevajo/ejdichj/fujegubebowubom.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/NhVjaSn/tupudug.pdfIn PDF document text
    • https://cdn.sqhk.co/vemosoveveb/hjxjcvj/photo_collage_maker_for_mac_background.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_60395d9646888.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuxedufexi/hfyR4Nm/icing_cake_recipe_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/xojafimib/Nqhgjas/dinosaur_rampage_mobile_game.pdfIn PDF document text
    • http://rorixuge.iblogger.org/26862515783.pdfIn PDF document text
    • https://cdn.sqhk.co/wixadigizal/pRnghhc/spiral_ball_game_app.pdfIn PDF document text
    • http://vudujupuboneg.22web.org/94362809962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5fcc797486d41.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/AhesjbT/universe_25_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/IgdjgGa/kung_fu_heroes_nes_walkthrough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_602dc5298266d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2766dcdb-cc50-4f10-b7c9-a175a45321c5/fusugiko.pdfIn PDF document text
    • http://betemeparax.rf.gd/barkers_of_kensington_mega_sport_manual.pdfIn PDF document text
    • http://tikilodi.epizy.com/scientific_calculator_casio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28f141f2-f46e-4ee5-b409-6f9e0a448a61/savebalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ecbd62-3a2f-4b35-ac7d-c53851ee88e1/pikatonobapikorowis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94e4a96-b85c-4ae0-b601-4a41f3f0498e/p90x3_length_of_workouts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ba5ace-9c31-441f-ab1c-1854d9a9b589/how_to_discrete_probability_distribution.pdfIn PDF document text
    • http://lapekekefexe.rf.gd/77452469987.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 5424 bytes
SHA-256: a6304eb12501ff787c23f4e1419d39685bebb5fcf17e4bea1815553560efa6b1
font_01_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 11396 bytes
SHA-256: 354c46fb15b62e0094594a6dbfc2949fa84ad0c2b5986368c5a1017707cd54e8
font_02_sfnt_off00014387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14387 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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