Malicious PDF — malware analysis report

Static analysis result for SHA-256 643eaadf7704994c…

MALICIOUS

PDF

81.2 KB Created: 2021-04-24 09:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dda945f406749a71c915b84468376839 SHA-1: ce464442b4b842cbf9dd884a58c19d58ad75679e SHA-256: 643eaadf7704994cffc704b38868d1ad420cec26d1465e51c2ccaefae1f4b81a
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. The document body, though partially corrupted, contains a title suggesting a lure ('How to find a good christian husband') and numerous embedded URLs, many pointing to disposable domains or potentially malicious hosts. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=how+to+find+a+good+christian+husband PDF link annotation
    • http://dexaputanit.mygamesonline.org/arquitectura_latinoamericana_contemporanea.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/KVihVuM/republique_francaise_histoire.pdfIn PDF document text
    • https://cdn.sqhk.co/womalakifaxa/ejjghik/83354162790.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/tracing_cvc_words.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://uploads.strikinglycdn.com/files/018556ca-d422-4ba0-af74-40c8f4e9539c/hp_deskjet_2545_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad7b7b10-d757-4385-857c-11948ced9e58/sumoxibigorowamavidekegop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb540382-ebf2-46b8-990c-53069a2783aa/arduino_uno_analog_pin_max_voltage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534a0db2-6031-4bda-8da0-dca98f06479f/29330431554.pdfIn PDF document text
    • http://dupodege.rf.gd/pitney_bowes_franking_machine_will_not_print.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08e7284-d8e5-4190-bb0c-fcb0c347ee16/42522168975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800d8b27-458d-4665-a310-fb7b78d552d1/55850739565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a22a6e-1e9b-42d0-81f2-f1a99af491b7/16233234285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed71634f-7fff-43df-95df-b160c029fa7b/brian_tracy_maximum_achievement_summary.pdfIn PDF document text
    • http://kogasalilim.epizy.com/mycobacterium_tuberculosis.pdfIn PDF document text
    • http://butemuz.epizy.com/dewalt_planer_dw735_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db088aec-4f7e-453f-8fbc-56304fd92b63/old_world_of_darkness_books.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/13261676491.pdfIn PDF document text
    • http://nawezurik.rf.gd/48907082963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1616552-55c1-4a79-b484-64f43e71a075/what_is_modulus_of_elasticity_of_steel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573d7a72-3f0a-48b7-8b6c-e7bb02dcea77/landing_gear_technical_drawing.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_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 5208 bytes
SHA-256: ba02dace0bc10b89cea98e5c5d9ee60d7dca17a821a8d23645fa2a6e451fbaec
font_01_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 10600 bytes
SHA-256: abd5c2e57a163a6e20f25e2fce5262d9344672874c0422607769fcb7e4356f4c
font_02_sfnt_off00012aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361