Malicious PDF — malware analysis report

Static analysis result for SHA-256 70df5437e00178f3…

MALICIOUS

PDF

72.6 KB Created: 2021-04-25 04:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 96279250d87e40f35ba9861ad26d3c11 SHA-1: 899bc94115270e65983d8479f81cfc9b8a124e47 SHA-256: 70df5437e00178f3514139875caaca18bfc86d49336e89f9bb07b6dd7eeec6a8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=can+i+play+microsoft+flight+simulator+2020+with+a+controller PDF link annotation
    • https://cdn.sqhk.co/pitadewedobu/AghG03E/66729699810.pdfIn PDF document text
    • https://cdn.sqhk.co/numorolele/bSGidjj/ticket_to_ride_europe_board_game_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/tja2ieQ/kung_fu_tea.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/jzibJAk/49188819867.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/Shgwghd/jufojebojubesakazixoxukav.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/ajdgiiq/snappers_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/safovokon/cH91Ahc/real_badminton_world_champion_2018_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fupupusamun/vhbjbgd/44817909401.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/hjha8n5/round_clean_3d_review.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/iR881je/fonowuxet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zabevog/ford_explorer_replacement_parts.pdfIn PDF document text
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_dfdb70dc12cd469da491bcb7aad0863c.pdf?index=trueIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_48e7706168164d81a1a5e0576c3764ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/what_is_molecular_structure.pdfIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_03829da575954bb393f629a7a13cfb91.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_cb909c8e843749e490f7fb96267fb9fc.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_5ca507de2ab84e909cdd4817baa8e5de.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_2656c3bfc80a4b588f3f5fe7e08a6399.pdf?index=trueIn PDF document text
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_c58429e85f4844249698856d311071e7.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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 5800 bytes
SHA-256: 9d2d48fba6a82dafa3e3723cc443b28f01c9b87147316696fffe20ee482085f2
font_01_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 10284 bytes
SHA-256: 7327e04f295f4f7f11ac60f9d7fbdc3095f5a33905f4bb4e04d571223f269cb9

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