Malicious PDF — malware analysis report

Static analysis result for SHA-256 83982e71145ad6c8…

MALICIOUS

PDF

77.6 KB Created: 2021-05-27 12:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4dffb290afef82cba6700816b6c94031 SHA-1: 9c9446809b38d679d7b6b714546abd5b6c82070e SHA-256: 83982e71145ad6c89f67b166f657e7aa47b276b87fedf93fa34ba43a471a006a
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 0.9998

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://wotilawijuv.weebly.com/uploads/1/3/4/8/134852567/3398965.pdf In PDF document text
    • https://liletizotefos.weebly.com/uploads/1/3/4/2/134234842/vidiwovubaxisupedeju.pdfIn PDF document text
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/veferukesiseze_zuborimaxuga_nefoz_bemob.pdfIn PDF document text
    • https://rozomibevepozif.weebly.com/uploads/1/3/0/7/130775668/junobikisisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446770/normal_5fe0b4d7d6429.pdfIn PDF document text
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/5944734.pdfIn PDF document text
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/zikigarisefeketava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486042/normal_60270ca760694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478952/normal_5ffa7b1ad6550.pdfIn PDF document text
    • https://dugedepap.ru/strik?utm_term=%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D1%2583%25D1%2587%25D0%25B5%25D0%25B1%25D0%25BD%25D0%25B8%25D0%25BA+%25D0%25BF%25D0%25BE+%25D0%25BC%25D0%25B0%25D1%2582%25D0%25B5%25D0%25BC%25D0%25B0%25D1%2582%25D0%25B8%25D0%25BA%25D0%25B5+5+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D1%2582%25D0%25B0%25D1%2580%25D0%25B0%25D1%2581%25D0%25B5%25D0%25BD%25D0%25BA%25D0%25BE%25D0%25B2%25D0%25B0+%25D0%25BD%25D0%25B0+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC+%25D1%258F%25D0%25B7%25D1%258B%25D0%25BA%25D0%25B5In PDF document text
    • https://dugedepap.ru/strik?utm_term=%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D1%2583%25D1%2587%25D0%25B5%25D0%25B1%25D0%25BD%25D0%25B8%25D0%25BA+%25D0%25BF%25D0%25BE+%25D0%25BC%25D0%25B0%25D1%2582%25D0%25B5%25D0%25BC%25D0%25B0%25D1%2582%25D0%25B8%25D0%25BA%25D0%25B5+5+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D1%2582%25D0%25B0%25D1%2580%25D0%25B0%25D1%2581%25D0%25B5%25D0%25BD%25D0%25BA%25D0%25BE%25D0%25B2%25D0%25B0+%25D0%25BD%25D0%25B0+%25D1%2580%25D1PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/13327f25-6c67-4b11-820a-7cf29d3779ec/nizokil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168a2cbb-f45c-4007-b1ff-c97377dade31/65262359675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4587b012-c42b-4547-9d67-cec6920a4b58/gomeseteroxevulexeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59adabb9-ab0a-4a48-8e56-a044447b35ca/motozapupev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55b181b-8378-451a-b612-b041021869b5/american_megatrends_inc_bios_password_reset.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 6440 bytes
SHA-256: bdc198c16f20393195ee84f6ba1562eb3ca359cc9643a325c200f90fd2399855
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 15072 bytes
SHA-256: 0ed095150446016eb8919771b0b77b2d3daca46f4669246c8b807e425979d494