Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbb83561f5d59b7…

MALICIOUS

PDF

78.1 KB Created: 2021-03-19 15:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ed16840b25c773a26644da1fa95f68f5 SHA-1: 22bf2e46d3bdae527cc8859f14cfa49900a2c467 SHA-256: dbbb83561f5d59b7ab4b2b556cbf77804d9227e466ce5b6d782bf17f3e7de3c2
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting and are likely part of a phishing or link farm scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=guidewire+policy+center+latest+version PDF link annotation
    • https://cdn.sqhk.co/satijumok/jfLgh5h/zokepa.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/gjedji4/39673146040.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/S30ieOn/6284839209.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/jdK6heS/star_wars_galaxy_of_heroes_rebels_event_hard.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/paper_folding_and_cutting_reasoning_tricks.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/calculus_atul_prakashan.pdfIn PDF document text
    • https://cdn.sqhk.co/taviboku/jg2V7s5/flying_jatt_film_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/aiiify1/real_offroad_simulator_3d_2020.pdfIn PDF document text
    • http://vitolebizojigok.22web.org/69555385532.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/djiJ1gj/25859304235.pdfIn PDF document text
    • http://dududuw.mypressonline.com/compound_shapes_rectangles_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/gjXZKie/kefaforosu.pdfIn PDF document text
    • http://xagigusutop.iblogger.org/can_i_get_chrome_extensions_on_android.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/497bda6c-de60-48d5-8f4e-8c05f82e7d6b/place_value_3rd_grade_anchor_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e0f0f4-6a71-4fa7-8677-b300f79aed4d/pt_cruiser_transmission_not_shifting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c3e3bf-7f18-4878-a793-6b1459831ac6/12235105853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18357fce-e791-4c5d-b94f-63a1f94df596/what_brands_of_chips_are_gluten_free.pdfIn PDF document text
    • http://lizesurova.rf.gd/1687292161.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/vilalagumipodexinanuv.pdfIn PDF document text
    • http://makeromevoju.rf.gd/building_construction_principles_materials_and_systems_download.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_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 5352 bytes
SHA-256: 336e3ec8a37991a526f8b950faf482025a1afdcac1463fcec141878998c722e9
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 10516 bytes
SHA-256: 38f37ac1645b7b6085c261042e5860381920a1402cc8d0ef5b78dc7620e223fe

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