Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84db78d96f829f6…

MALICIOUS

PDF

82.0 KB Created: 2021-03-15 01:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fb5f38953a6e70b80c158bc098daee6e SHA-1: 262421656cf3c1728ddf405c0454a76e1ffb7c70 SHA-256: e84db78d96f829f6c905aa5349b991890ff4438aefdc10d54b6d0debe414c3d9
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, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary external URI pointing to 'https://mezovuduw.ru/strik'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to a malicious site.

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=fluke+435+series+1+manual PDF link annotation
    • http://zaxiluxedexu.getenjoyment.net/fusionner_fichiers_mac.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/adventures_of_huckleberry_finn_facts.pdfIn PDF document text
    • http://paselon.getenjoyment.net/visoxubogusaruxugugeno.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/holt_mcdougal_algebra_1_common_core_teachers_edition.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/sat_math_practice_test_answers.pdfIn PDF document text
    • http://gefejisu.22web.org/caremark_specialty_pharmacy_prescription_form.pdfIn PDF document text
    • http://golixudib.mypressonline.com/how_to_make_animated_in_photoshop_elements.pdfIn PDF document text
    • http://jukosulefutiwo.22web.org/pumub.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/pdf_file_reader_download_for_mobile.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/zmodo_camera_setup_troubleshooting.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/e9ae0a9a-d66e-4a9c-b5a0-0d9fc6c42812/71472309185.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/22133799935.pdfIn PDF document text
    • http://noxukimu.myartsonline.com/rafazofurolof.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/blue_jackets_reverse_retro_jersey_schedule.pdfIn PDF document text
    • http://tijibito.epizy.com/43036370057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7ed800-7c3e-4fe8-ab93-7ed34a737d7a/lebawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a168c8f3-6402-459b-abe8-5c6002ccc759/supernatural_book_of_the_damned_review.pdfIn PDF document text
    • http://kujafugakare.epizy.com/82660583092.pdfIn PDF document text
    • http://kemesuxaw.myartsonline.com/rilejezoro.pdfIn PDF document text
    • http://povodakav.myartsonline.com/cripple_creek_banjo_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e4c015-db0b-46fd-a9f3-be8ea4eb95d3/welore.pdfIn PDF document text
    • http://numotuvafoja.epizy.com/bodyweight_training_system.pdfIn PDF document text
    • http://pagupim.epizy.com/chaiya_chaiya_remix_video_song.pdfIn PDF document text
    • http://waraxiv.rf.gd/79601178718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17cfe94d-957f-4b35-84d6-0a0d42a62beb/philips_respironics_remstar_auto_a-flex_manual.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_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 5280 bytes
SHA-256: 1d48fdb7be65fd4494dbbae6fef00d7038eda4d4e484bc81a8807926b1ac4d5f
font_01_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 12256 bytes
SHA-256: 9c69ffc29250f4911efa1fd7444183473362d358342ea07a9a1b4882c303c271