Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dafe3c617f42cf…

MALICIOUS

PDF

81.4 KB Created: 2021-03-17 23:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7526e5778560aa6a23fed94c4ee0065b SHA-1: 59895c5fb0734e696f4b850038f1ff4bc860dc7e SHA-256: c5dafe3c617f42cf809e3c549203fb4ac9b41560b0c71d210f0662ea5a657c42
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to drive traffic to malicious sites. One such link, 'https://lozipotod.ru/123?utm_term=bicuspid+aortic+valve+esc+guidelines', is flagged as unknown reputation and is likely the primary malicious destination. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggests malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=bicuspid+aortic+valve+esc+guidelines
    • https://cdn.sqhk.co/bidelefo/jhgjhdN/scary_teacher_3d_game_download_for_android.pdf
    • https://cdn.sqhk.co/tokofape/N7Ujcja/86603603520.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/80498f9e-d1d0-472f-92ba-f4ba1917b1b2/lupizipagitesitumowifod.pdf
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_5d65e062d9f34280995f04db25b3d4a8.pdf?index=true
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_46982445c2b741c3947cf1f9305893c1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0495bacf-c861-4061-ae55-a7d4e50d52a3/how_to_update_flash_on_chrome.pdf
    • https://s3.amazonaws.com/pegek/40683991694.pdf
    • https://uploads.strikinglycdn.com/files/c49316cc-f2ac-490b-8f0d-ccab5b65fb22/a_practical_guide_for_policy_analysis_free.pdf
    • https://uploads.strikinglycdn.com/files/60b2aafb-a0b9-4c88-ac39-8c11acbd3c36/what_is_error_1001_on_netflix.pdf
    • https://uploads.strikinglycdn.com/files/d29bb85a-20d0-4347-a364-2002a244437e/ikea_malm_queen_bed_frame_luroy_in_black_brown.pdf
    • https://uploads.strikinglycdn.com/files/58190a1a-48a3-4174-9bc1-a2f88e50a15d/47324042236.pdf
    • https://uploads.strikinglycdn.com/files/711fcb18-0865-423b-988c-cafef96ab0e0/jeep_cherokee_maintenance_costs.pdf
    • https://s3.amazonaws.com/mixanaz/i_rigoberta_menchu_summary.pdf
    • https://uploads.strikinglycdn.com/files/0b2c1c43-174d-41f8-87d1-f755f5988478/jatoromoroxozonogawik.pdf
    • https://s3.amazonaws.com/loneminovu/dell_optiplex_760_specs_motherboard.pdf
    • https://uploads.strikinglycdn.com/files/6cb5fe40-d65e-419d-b55f-5986099fe734/zisomepulikibol.pdf
    • https://uploads.strikinglycdn.com/files/8c6ef3c3-e2b8-42de-bade-00bada295859/gipasusomupizijivegefu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea3.bin
4f38f551af937d07cad63003e5f78d0eb1aa35009b96efc9ee9682647ab1f46e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 5348 bytes
font_01_sfnt_off000110eb.bin
cdf4c89a3d97d01d7852fdd7f1b445199d7729946c9978fac14f1febde1c4044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 11424 bytes

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