Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec48a92b3b2f2d5…

MALICIOUS

PDF

96.9 KB Created: 2021-03-27 21:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2daf0431692b7a3355e0486d900eadbb SHA-1: 092a09c1c75e95ac21302e6292a8db5829c4579a SHA-256: fec48a92b3b2f2d54bb7a52eef3d2419ff25ee2569a0af8306beaab0bd9fb7a9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of the primary external links points to zajinet.ru, which is likely part of a phishing or SEO spam campaign. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/123?utm_term=best+android+watch+os PDF link annotation
    • https://cdn.sqhk.co/xorakulenido/bhaugft/17557824125.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/LbUiiic/sword_art_online_game_pc_requirements.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://s3.amazonaws.com/wizomoravazub/9348763852.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_cf383bd0f23746588edfaf3cdde0cb80.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_1cfb809fc2894d35bf412f27b269a670.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/30325336179.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_1374b474b46147c7aed4bfe20e82235b.pdf?index=trueIn PDF document text
    • https://3c3a732a-bc26-4be5-bc29-345d3dbc3408.filesusr.com/ugd/63a963_7a738b0a9a544e64956620537a5db778.pdf?index=trueIn PDF document text
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_ce3746a9070d4dff92461c42267e0f14.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_5ca105d33a2743798f6a476b466188a5.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_d9f935dae8fe475580360b0a7d4ca613.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/bogudowu.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/wulofaker.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/57209927092.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/52449853966.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_e923b6eaaaeb42e1b3dc55385a34a193.pdf?index=trueIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_2a41c99ae80d4ebaa5a021e8d4d2f12b.pdf?index=trueIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_7e89e25f1b4c427e8ad51fa974c02f3e.pdf?index=trueIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_7e91bfb51138413f8bd97aa24f718033.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_a68942fbe63543eebf0f5814459a5e3c.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_d8cf7adef38d4e69bc26a550a29dc52f.pdf?index=trueIn PDF document text
    • https://504b7f7c-d27d-4f2b-a6eb-e8dc7cf660cf.filesusr.com/ugd/6ba015_2bc54ceca4ef4fe194eb671e9783e2ec.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 4924 bytes
SHA-256: c3c288899e1ea1b837b2b879f41a2c766ea40ea727aef2bb6dff5fde7e714683
font_01_sfnt_off00014125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14125 11452 bytes
SHA-256: d786189305f6d07e6da66c72d03af2100eb21f632d249496b08c08eb2cc0ed91
font_02_sfnt_off00016818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16818 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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