Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22f11b7c59f4aec…

MALICIOUS

PDF

78.2 KB Created: 2021-03-27 20:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8d00d7973637663ea6091d8c1378e65f SHA-1: 59ce8e8ef32e4eda3154afd06e7f162fdaa58532 SHA-256: a22f11b7c59f4aec0723b46d8113647d8d7d9e981f50b8597c3aa055823075b3
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 0.9992

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://bologen.ru/wix?keyword=cuentos+de+la+cripta+m%25C3%25BAsica PDF link annotation
    • http://fitit.space/dyson_cinetic_big_ball_animal_vacuum_filter_cleaning7m8zb.pdfIn PDF document text
    • https://fukajupiboxa.weebly.com/uploads/1/3/5/9/135973929/butum.pdfIn PDF document text
    • http://pubggaming.online/acorn_80_stairlift_user_manualdgzpm.pdfIn PDF document text
    • http://housefashion.ru/ratexifazexepebadolex01497.pdfIn PDF document text
    • http://leon-stavki.info/ron_paulk_workbench_2_plansue9xq.pdfIn PDF document text
    • http://autobuff.xyz/9458914712177w7m.pdfIn PDF document text
    • https://mobugozuko.weebly.com/uploads/1/3/4/8/134869294/xibidipifesixe.pdfIn PDF document text
    • https://keboxineb.weebly.com/uploads/1/3/0/9/130969034/0bf90d788726.pdfIn PDF document text
    • http://flowerport.store/zoxanilazavoseraveridmbkee.pdfIn PDF document text
    • http://trixy-matrix.space/delonghi_capsule_ceramic_heater_1800w_reviewv9cq8.pdfIn PDF document text
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/1585563.pdfIn PDF document text
    • http://nikecortez.net/how_to_charge_lg_bluetooth_headsetcmafi.pdfIn PDF document text
    • http://ergors.space/memazujove1d8ot.pdfIn PDF document text
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/denixu.pdfIn PDF document text
    • http://nncucuucuc.space/auxiliar_de_tecnologia_da_informao_salarioq9fqq.pdfIn PDF document text
    • http://buloshnaya.site/31520721626lspay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a6bad622-5621-4a9f-aac1-1b9dbbd41194.filesusr.com/ugd/f9d4cd_7854ce21f640417896ed338b20ebb2eb.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_bdff3f2bfde245c2b687e5bf2daa4ae0.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_d07b13cfe7fb45c1b93f9b212d185828.pdf?index=trueIn PDF document text
    • https://229013d5-0e14-4531-be8c-43df84542e77.filesusr.com/ugd/e4a895_728b6447454a4d3a9416d45232e686a1.pdf?index=trueIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_b6a50b372b8b4b77afe0b8fec3ca768d.pdf?index=trueIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_d5506c8b8acc476a8268f8018c45197a.pdf?index=trueIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_4bf88e6c80ce4977b158c9bb7f7e002d.pdf?index=trueIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_a915f60a75224185b2ddade7b9677611.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_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 5240 bytes
SHA-256: 3d6a39acd927b79a51d91f92e59bfd5a5746af6d098ca73ed04472177c817348
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 12712 bytes
SHA-256: 3ac8ab2083124c077923d125adaa76277eb1d7add07b8a3ce03142e08382f658