Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb403cc5e2fc3530…

MALICIOUS

PDF

81.5 KB Created: 2021-03-24 19:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 85662334697bbce9b5ecc49d91d09cd0 SHA-1: 9860eb50b9cb08e5002a6e9752b9c99b63c44d8d SHA-256: bb403cc5e2fc3530cf91e1feb9981f045ffeb3d1c0e1c0bf4c78e493443f36e7
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 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=how+much+does+mmpi-2+cost PDF link annotation
    • https://cdn.sqhk.co/kitujesijak/jhgjbgj/65320574759.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5ff6ae81e6b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_601ab0b49a74e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389821/normal_5fcbb8a964d29.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/hQmoFhe/wotutalujekoxipaga.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/0jghecx/78129752760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_603b46031f0a5.pdfIn PDF document text
    • http://foyou.store/889888979288ijy1.pdfIn PDF document text
    • http://top-odejda.com/melonenurijimofoporabew5ripw.pdfIn PDF document text
    • https://wufunuxiropid.weebly.com/uploads/1/3/2/7/132712508/60f4eb2e0d2e3.pdfIn PDF document text
    • https://zumezotuxo.weebly.com/uploads/1/3/4/3/134332991/pomodolisutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368474/normal_5fdccb546ef06.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/IjcDjcD/bad_day_for_the_cut_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_5fdc3d5dc942f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_60403b2d6aa21.pdfIn PDF document text
    • https://jivowewowigopap.weebly.com/uploads/1/3/1/6/131606746/pozema-kukusiwab-siluzowif.pdfIn PDF document text
    • https://cdn.sqhk.co/gigatakel/jikPXjj/rotojizutaraxulevasuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_60374f463e835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_603d53b3a4017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377706/normal_5ffff62f49247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_2341b99e56a64727b0597c61a093550f.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_ce356401dc914fb3826ddc2c9e31495c.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_94a8a105f0e34d5d80dcac4495263630.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_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 5192 bytes
SHA-256: 00bc95063410c3594ae6b111319d672a9297a118ce13b83beaa8089be6cecdbf
font_01_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 10844 bytes
SHA-256: dc19aa41155eaa5ec6597bd1933b95568b94f4d85e7a24a3a5b6fe7db3afc68d