Malicious PDF — malware analysis report

Static analysis result for SHA-256 37540e9173015788…

MALICIOUS

PDF

86.7 KB Created: 2021-06-10 23:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e03e2d2a032daa52de1ddd2e63a218e9 SHA-1: 254871a241e183248977d8a394fcaa564961ce6f SHA-256: 37540e91730157882d1af733ced7855fc61fbb43f733777ff0afbaaef1243413
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 0.9982

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://catamma.ru/pbw?utm_term=happy+birthday+bhai+video+status PDF link annotation
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/df41d1542.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/lamafodedaven_wifemedabopupin_takitetul_baxiwelekali.pdfIn PDF document text
    • https://gogafijunovox.weebly.com/uploads/1/3/4/3/134322332/karabodoma.pdfIn PDF document text
    • https://posuxosovovenev.weebly.com/uploads/1/3/4/5/134593520/xejixi.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/20283982.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://uploads.strikinglycdn.com/files/107a7178-5f03-47ee-ad43-ca4f45370659/30763315705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3330eec-09b3-4b6e-960a-a2a6e729ac8b/29332374347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/947b4138-719f-41dd-a90e-e9d6dfe94c93/7699768771.pdfIn PDF document text
    • http://sawanixum.pbworks.com/w/file/fetch/144780294/78083117621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ea23fa-71ac-45b5-83ae-95d6bc08fa0b/88161370120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f10dfb-6fdf-45d0-98ed-5c23c5464ff2/2005_ford_6.0_diesel_repair_manual.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/w/file/fetch/144624423/glencoe_physics_principles_and_problems_2017_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3578eb-9ebf-42ee-af87-09b53ff1f303/dieta_para_ganar_masa_muscular_hombre.pdfIn PDF document text
    • http://zidedabi.pbworks.com/f/dls_2020_hack_version_app.pdfIn PDF document text
    • http://xetuduju.pbworks.com/w/file/fetch/144532224/nojepegetodexotuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4409d2-6ad4-4860-ac6a-b8ee50dd8c45/portable_reloading_bench_designs.pdfIn PDF document text
    • http://zuvumuname.pbworks.com/f/vozijek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7e45c0-ac70-4aeb-a7f4-3063fb1fefa5/how_do_i_use_my_sharp_air_conditioner_remote_control_lg.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/8984155511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed0ee46-9ffd-4bbc-b689-ffe2044cd3b9/bikagumesofepafiwexobaza.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144561045/how_to_read_rolling_in_piping_isometric_drawing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6880205d-5e9f-449c-9917-fec757555df3/24496704466.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 5052 bytes
SHA-256: 89c39568bd0a36548e97c47ee1b8b0ddb86677ab3904f662a2f1c6f82bb7c748
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10860 bytes
SHA-256: a9f7f653cb6535abf1c5a0978f6e8a7577cd62d0cfb1a40169c57a61642f118a
font_03_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939
font_04_sfnt_off00013deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176