Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72ce13c1c6fb05d…

MALICIOUS

PDF

83.3 KB Created: 2021-05-10 00:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: acbbccb0af83fb4b0856961e1d7cb921 SHA-1: eb7ab85925e6dccbdfcd1e49f48440f4ac809c3c SHA-256: a72ce13c1c6fb05d62f27122d3ce2e0914b94e37037c2535c9c7ce3d1c63c12b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, one of which is `https://midufefew.ru/strik?utm_term=ferrari+california+t+for+sale+florida`. The presence of a large number of links on disposable hosting suggests an attempt to distribute phishing content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=ferrari+california+t+for+sale+florida PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451206/normal_601267ef6d4aa.pdfIn PDF document text
    • http://yognat.space/lufezetapabeesgi.pdfIn PDF document text
    • https://guvusogom.weebly.com/uploads/1/3/5/3/135324715/sonubutegijuv_vuwiju.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/1ff460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_60115746c391a.pdfIn PDF document text
    • http://thecabinets.xyz/band_set_music_mp3_free_downloadoysba.pdfIn PDF document text
    • http://tesocoin.online/look_whos_back_trailer_deutsch8gu5f.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/425ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_600b2e599ed9d.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/ridugowemitimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388282/normal_6015da08262dd.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/98253925963.pdfIn PDF document text
    • http://cashthe.ru/how_to_fail_a_neuropsychological_testgvf7x.pdfIn PDF document text
    • http://study-english-05.site/489756745265kdte.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://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_86dda4054a6146a89da27e919fd13db8.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_14906dfc64954ef8abb753f2a4d94cae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b240d783-2858-433a-b147-adf6acbbab2b/sovosusedabekefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c580f3e0-97d7-4af3-9660-21be37368f5b/jhumpa_lahiri_a_temporary_matter_1998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5789e023-c055-4ddc-9ed1-fad5f298fb14/xitazekadalazuwuvusakume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32476ef9-48ed-4bd2-b7c5-846ef2d8f5bc/how_to_reset_moto_g5_to_factory_settings.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_a09a7299c699478f8e8b62da7a46f11f.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_4f6615c7a6404c8582096cf8ee8f12c5.pdf?index=trueIn PDF document text
    • http://panexorumilogim.myartsonline.com/64496751241.pdfIn PDF document text
    • http://litorow.myartsonline.com/3_bedroom_house_plans.pdfIn PDF document text
    • http://kejagabato.myartsonline.com/debiwapojivem.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_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 4756 bytes
SHA-256: 929d5d3b510b3d81b2721e8f0e5d52fe8d493bfb65ebd81ab2ccb99692cc2803
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 11876 bytes
SHA-256: 785acf57c92709bac70428498122c4406a42bf745c56cfa82abae7a2b3b80fab
font_02_sfnt_off0001314f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2