Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ba25456f310323…

MALICIOUS

PDF

70.6 KB Created: 2021-04-06 07:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3bd9ddbc6c6210ae8fa1fdf96c88e1cd SHA-1: 51362872cbd1c085caa8ac38ec3c7fcd97ad6585 SHA-256: 84ba25456f3103239d84c8a51b56f3198b5838e6df41451ad9714462e99ddded
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://jacksth.ru/123?utm_term=diwali+festival+images PDF link annotation
    • http://bizbize-yeteriz.org/overwatch_battlenet_download1hica.pdfIn PDF document text
    • http://songkfrk.site/5504440985832i9e.pdfIn PDF document text
    • https://rorenaziva.weebly.com/uploads/1/3/1/8/131871817/tugodekosusupuzenup.pdfIn PDF document text
    • https://tenewokuge.weebly.com/uploads/1/3/1/3/131379402/wodepoze.pdfIn PDF document text
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/jerina.pdfIn PDF document text
    • https://sidagavaru.weebly.com/uploads/1/3/2/8/132814791/guguvojuk_razuniva.pdfIn PDF document text
    • https://nozezekotelipub.weebly.com/uploads/1/3/4/8/134883262/jedogogelig_vovuwiti_zuzidubusut_tatov.pdfIn PDF document text
    • https://vavuxajibibugu.weebly.com/uploads/1/3/4/4/134472661/329638.pdfIn PDF document text
    • http://seamanygau.best/guzabosejavaxitpoho.pdfIn PDF document text
    • http://disclosures.space/windows_rotate_display_hotkey9x36f.pdfIn PDF document text
    • https://xadifopelizil.weebly.com/uploads/1/3/4/7/134771643/bolegij.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/d293d5c8-be1b-4599-9f21-e9cba499af2e/craftmaster_hot_water_heater_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/salary_of_aircraft_maintenance_technician.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94cd8c5-d70f-48e1-84e2-3577191cd0c0/the_tempest_analysis_act_1_scene_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/2834435062.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_7a72688a7cde4c9fbf41a1ca8ebf5dba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ddf5ce-d015-4765-87fb-be699d44f2c1/how_to_lose_weight_fast_in_2_weeks.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_74575030483047dbad3598b44cc00ec1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c30fbca-f076-4b82-8fe3-13139ca2f457/farming_simulator_15_pc_cheat_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84cd935f-0e8f-45d2-99d2-3813a172849f/singer_simple_sewing_machine_3337_troubleshooting.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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 5144 bytes
SHA-256: 853b338676e06a12876272f0cb688b0ed28ecbd0686737a54bfb69552408abeb
font_01_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 10208 bytes
SHA-256: 67d8eda3ffc6c93edcc23b7ab8b65326ca6f582a1cef55a1fb8dd092b7326a17

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