Malicious PDF — malware analysis report

Static analysis result for SHA-256 a335fd9b4154390b…

MALICIOUS

PDF

82.6 KB Created: 2021-04-07 02:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a089925c03db0317b89ecad3cc7d7c9f SHA-1: 2ff832c5a942d9399b7ba04f5e30abdc4ef8c961 SHA-256: a335fd9b4154390b2dd08152f011d4aa259d6e9c8ad51b021229c2d0f68ba61d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with a prominent one being `https://mezovuduw.ru/strik?utm_term=ge+not+spinning`, suggesting a phishing or malware distribution attempt. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent to redirect users. Although no scripts were extracted, the overall structure and URL findings point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=ge+not+spinning PDF link annotation
    • http://helplnstagramoffice.com/denon_avr-s900w_firmware_update7m8ya.pdfIn PDF document text
    • http://mihetos.xyz/mukuvorjzfmy.pdfIn PDF document text
    • http://mailedflkf.site/my_rainsoft_water_softener_is_not_workinga065i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5ff10cc5796cb.pdfIn PDF document text
    • http://lusizekemuva.22web.org/can_you_flat_tow_a_durango.pdfIn PDF document text
    • http://rajeziriga.scienceontheweb.net/clasificacion_taxonomica_de_animales.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_601ae2a80ce63.pdfIn PDF document text
    • http://xenuven.22web.org/bumblebee_2018_transformers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417313/normal_5ffea128c1a77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_600fde6b87d7b.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/jovidofutaxofemerakobije.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/arya_2_movie_free_in_tamilzt75z.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/jelek.pdfIn PDF document text
    • http://perakaganiw.iblogger.org/nationalism_in_europe_class_10_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fe5f1c58d849.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/clear_bitmap_imageview_android.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_d14a58863d424bb3ae3c5e4391e24685.pdf?index=trueIn PDF document text
    • http://fugewep.rf.gd/29598528418.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/how_to_reset_the_keurig_coffee_maker.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/lozenibifij.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/loch_awe_fishing_reports.pdfIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_632bc16769374a4aac762b14825454d9.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_3926ec0c215842bd9aecd73890f8c9d6.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_930ecef42535479dbd199de5751b35ed.pdf?index=trueIn PDF document text
    • http://zutaturusix.myartsonline.com/34327720974.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_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 4680 bytes
SHA-256: 682d138b914c155e0fe067308de94e91e1ee54717057706101aeedeae8371bfc
font_01_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 10552 bytes
SHA-256: 96a455385e97d508effc1bff8f2284e65ff1e5a7fee8ccb0dfff225254dc3043