Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4c88b8ddf04cc5…

MALICIOUS

PDF

77.1 KB Created: 2021-03-17 04:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3ffaf433f2485d7740d411c94e6d8d74 SHA-1: 594a598ec6cf0515167475fcfa18e5c2e6349cd5 SHA-256: 6f4c88b8ddf04cc5082116ba6f99a6a7432f0941afb19278e08ab9063aac572e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=agatha+christie+filme+wikipedia+italiano PDF link annotation
    • http://creditscorecard.info/maze_runner_2nd_bookgyvtw.pdfIn PDF document text
    • http://lozosomegav.iblogger.org/lerelureriw.pdfIn PDF document text
    • http://216tilford.com/mcgraw_hill_economics_textbookzaxu7.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/9380016446.pdfIn PDF document text
    • http://lassituda.online/script_type_template_htmlykgtd.pdfIn PDF document text
    • http://dudoxanudito.scienceontheweb.net/email_marketing_examples.pdfIn PDF document text
    • http://puwufonizezez.22web.org/jagekegizoxozemabevekefun.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/57800493925.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/xoguroniwag.pdfIn PDF document text
    • http://dmdmassage.com/java_swing_guidebyv8i.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/ad716c7d-1a9f-411f-9ef7-082972ad23ee/diono_radian_3qxt_vs_3rxt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc536fe4-0304-4aeb-9f71-eb3960e0ff49/d_and_d_players_handbook_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e782810-237d-4b77-8d1a-ba646375e9b7/linda_goodman_relationship_signs_free_download.pdfIn PDF document text
    • http://pivutabomenatam.rf.gd/daniel_goleman_inteligencia_emocional_datos_del_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0edcaa-8b53-419c-9e5c-e1f63d0f1e39/6160_keypad_honeywell.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_d336cfe326594c8699a79386552204ce.pdf?index=trueIn PDF document text
    • http://gazisemodab.epizy.com/56067527425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b161046c-1d65-4070-8c28-a6036569e113/how_to_start_smart_bracelet_m4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a2ec78c-d3de-4672-b0e8-2351baffc65f/41429944766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a9b039-d434-405c-b2e2-feeb8cd362a3/how_does_a_portable_air_conditioner_work_diagram.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_23da992789e3419d89474a6a1285bddb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6540b5b-b581-4895-92de-761ee87c6e1a/xitevufux.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_deee340fe92a438b8a575a33741febc9.pdf?index=trueIn 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_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 5712 bytes
SHA-256: 571e539aebfc68109e40f2131c1d01fde71bb3983580d5ec5c0dd5f6c5a8fc96
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 11284 bytes
SHA-256: 489fb36a7ac34bbb41f7555e8387fcf8442173271794b1c29371f1527e60a0f7