Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a3407ae9a7cd9c…

MALICIOUS

PDF

101.7 KB Created: 2021-04-04 12:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 43a5de2381eba1af080a468b5a817c0e SHA-1: 6824e23bf34366f9f8fd339f89cd6d705004a77e SHA-256: 79a3407ae9a7cd9c18b68aac562410e497ff9b054f9d4fdd69ed5673e86c4a96
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 external URIs, with the primary one being https://vilenefex.ru/strik, suggesting an attempt to redirect the user to a malicious site. The document body, though heavily garbled, contains text that appears to be a lure related to a 'Powerflex 755 user manual'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=powerflex+755+user+manual+espa%25C3%25B1ol PDF link annotation
    • http://foyou.store/possessivpronomen_germancyd1z.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/pneumonia_bacteriana_em_caes.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/kihphhg/translate_english_to_spanish_documentary.pdfIn PDF document text
    • http://sunny-web.ru/skulduggery_pleasant_series_reviewtbjk7.pdfIn PDF document text
    • http://bifozitixexidad.mygamesonline.org/ball_milling_method_for_synthesis_of_nanomaterials.pdfIn PDF document text
    • https://tabivivefevevu.weebly.com/uploads/1/3/4/8/134889686/3beaefbe3c.pdfIn PDF document text
    • http://volosaty100.xyz/best_pill_for_moodsc207m.pdfIn PDF document text
    • http://cuzinfo.ru/house_of_night_destined_free_downloadbaujn.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/0jgadgi/mermaid_wallpaper_hd_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/UgjFThh/83726586997.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/video_games_history.pdfIn PDF document text
    • http://hidver.com/effective_communication_skills_definitionzilcq.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/heW8yid/lutipegajazizulovunukex.pdfIn PDF document text
    • http://tuzupibu.scienceontheweb.net/que_es_la_administracion_hotelera.pdfIn PDF document text
    • https://wikoxunorature.weebly.com/uploads/1/3/5/9/135968981/891265.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rizeluma.epizy.com/best_business_plan_format.pdfIn PDF document text
    • http://tetizawoto.rf.gd/medical_internet_of_things_and_big_data_in_healthcare.pdfIn PDF document text
    • http://rigutogivopum.epizy.com/dymo_letratag_lt-100h_handheld_label_printer.pdfIn PDF document text
    • http://bokapis.rf.gd/61126454054.pdfIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_a93b7ce866854cc5b245d55c881fd6a2.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_4e90deb96dbe4888b30af0614089a910.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_b3ec19d2921448bb9158febd46598c9e.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_dc4f25e22aea47f8812c3023d33d6b87.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_8485b3318b804d26948d04ca5bf3c512.pdf?index=trueIn PDF document text
    • http://gadoselegi.epizy.com/84088439253.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_off00014c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6D 5624 bytes
SHA-256: 22c23673564d29a38f8814e117deae514f6d480066f01e7aa6cd4dc985ed6beb
font_01_sfnt_off00015f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F55 12092 bytes
SHA-256: 2cf98a55c16a5b04661e3dea847c5b714fd2ac72c869f45ea147307ed5ed7ec2