Malicious PDF — malware analysis report

Static analysis result for SHA-256 f099e24c76666a51…

MALICIOUS

PDF

85.4 KB Created: 2021-05-20 17:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 67e0b7811005275fc02262e0a39608f4 SHA-1: dee77d57ed9c1a86b1d6192e61f052316084a692 SHA-256: f099e24c76666a51df0da8bafd3548ed80fe2ee433c713b9b832e87310b5ad7a
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 0.9990

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://nipisod.ru/strik?utm_term=irregular+verbs+list+sheet PDF link annotation
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/248623f84bb64.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/vunowugeguzirero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_605563895805e.pdfIn PDF document text
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/4652814.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/7856360.pdfIn PDF document text
    • https://rutebamem.weebly.com/uploads/1/3/4/8/134862863/wowasesopitababewuko.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/6879872.pdfIn PDF document text
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/kivofoxeso_depovolaf_rokek_waxixaxadudasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496380/normal_5ffa23b9ca09a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459921/normal_604df1b62f90e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5fcb01b3636f8.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/wogapotez-jexijijeg-bafejomuzebato.pdfIn PDF document text
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/xezafuwa_padudaditefemig_ropeneg_potujis.pdfIn PDF document text
    • https://zusavakaki.weebly.com/uploads/1/3/0/8/130815140/f1105620c9f.pdfIn PDF document text
    • https://jumabesabixoduz.weebly.com/uploads/1/3/4/3/134368642/zesejatoduvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1570ad-ab83-40d4-8881-4ead71129883/introduction_to_probability_and_statistics_milton_and_arnold_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3eb240-d465-4ae5-aa39-922e9e4f90d0/zamegemubodexojuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dabfb057-48af-4c34-8f12-3cd303845220/39962842767.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/23115503848.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/bombproof_your_horse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41b869a-2160-4cdb-b238-42e36c1c23fb/fojav.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/49145293129.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/dojavazepevokudin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5e5684-e008-4ac1-ae2b-1723a24fb669/jbl_flip_3_stealth_edition_price_philippines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 5084 bytes
SHA-256: 3e9376318565074d9c96cfb38400689425f8012fd92df33c055feef22114b48f
font_01_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 11968 bytes
SHA-256: d80e62a4dce1d921e072d8b908e9d803de932690b2afb1371646277978261339
font_02_sfnt_off0001330e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330E 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e