Malicious PDF — malware analysis report

Static analysis result for SHA-256 898b08f5ae20799a…

MALICIOUS

PDF

74.2 KB Created: 2021-04-01 02:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 77eef79c5f6d820b03e3fa40f8a45af0 SHA-1: 668f1e7ded399e4c88219aaef886fe26eeee03f9 SHA-256: 898b08f5ae20799a9445418f2edd043802a02f55f6e085dbc9669d8b2dbe277b
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 0.9998

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://ponafet.ru/wix?keyword=5.2+puzzle+time+answers+geometry PDF link annotation
    • https://labajamipudoxa.weebly.com/uploads/1/3/5/3/135399896/datimixewapirub_ninewevufumidin_posifasijixizem_vobilazil.pdfIn PDF document text
    • https://cdn.sqhk.co/negapevu/gfFhict/bewegovovi.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/eOWebGi/off_ice_hockey_training_exercises.pdfIn PDF document text
    • https://fexiganariv.weebly.com/uploads/1/3/0/7/130739648/ed2f0db11948e.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/2214628.pdfIn PDF document text
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/tanuxixivijo.pdfIn PDF document text
    • https://dujeranisijoku.weebly.com/uploads/1/3/0/7/130776063/sinuxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_f594e3c2a50a475d8537450bd064ed2f.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_2196be29945543e0bf60d1479e3d0a9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/vuzikoxorewenajulilususo.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/django_template_dictionary_field.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/809c59ec-55d1-4297-9887-ec43b363ec4e/does_liam_die_in_the_darkest_minds_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a1cdd39-3b9e-40f6-b7d3-b5fb9af48401/21866187141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da940ed-b66e-47ee-b925-097eac8ecccf/software_development_life_cycle_sdlc_methodology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da30694e-c2a5-4915-86ff-9798ab8bcc73/is_usps_shipping_internationally_right_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e577dea-86ac-485d-98ea-964641c9ace3/17_day_diet_menu_cycle_2_food_list.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/home_assistant_mqtt_sensor_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2e7c84-6162-477f-bdcc-5410babac122/wedemolajebimozidagowat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2acbb54-2b9f-4e90-89c3-c22009170185/what_exercise_with_dumbbells.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_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 5576 bytes
SHA-256: f4c437ae77ff315c0ca0c18f7a88c9e02e58114675fe1e5fc3e5c816a777fd66
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 11252 bytes
SHA-256: cfa5271f572aa85d99712dcb228a8cbb3ae0edf97f2f881e5750da200ea25b69