Malicious PDF — malware analysis report

Static analysis result for SHA-256 becdba938cc3be99…

MALICIOUS

PDF

72.0 KB Created: 2021-03-28 11:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f5aca9135ec1da0d685c530c1ef96e8d SHA-1: d42b39ac02e0b1b22c20485658761c24b4da43e9 SHA-256: becdba938cc3be99a4f96f5bf78dee33ea699988586ff486aa7f712e9bb7b479
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, indicative of a link farm designed for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. The embedded URL and the heuristic findings of a link farm and a download button lure support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/123?utm_term=car+autocad+block PDF link annotation
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/932b32b0501b.pdfIn PDF document text
    • https://kexeluki.weebly.com/uploads/1/3/4/6/134627649/sewoleninekilu-zejepuwaw-fowebutevojip.pdfIn PDF document text
    • http://remastacer.com/letter_template_uk_201938j4u.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/behavioral_genetics_6th_edition.pdfIn PDF document text
    • http://sotipidikukunow.getenjoyment.net/52654396610.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/golibedoviwasitewevavyun9d.pdfIn PDF document text
    • https://gixunilaw.weebly.com/uploads/1/3/1/8/131856646/3547138.pdfIn PDF document text
    • https://xifutasuwisesa.weebly.com/uploads/1/3/2/3/132302919/tesinekug.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/10896090157.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_7395968fa9fd43c1b312fae00bc12df4.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_8cc5373293de4b13bdacb9aa260c3194.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_84feadd3597747f48c316600f215ea6a.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_8519ff4d88534a1381f89274d4485d07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/ridiradipomepa.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/best_ad_blocker_android_2019.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_84b09c1568ea4eec81c4157b2a0ebe1e.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_3e2545546df3400bb6808286af6a3660.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegebunov/cayde_s_will_guide.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/english_german_dictionary_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/sebebawokarazexiti.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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 4864 bytes
SHA-256: 63b7863827df331e95737229b8cf9109e0f35439db9bcd8b0fe5587ece2536fe
font_01_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 10564 bytes
SHA-256: 68e7a77c26c218f603da6ad749e18cdbb7a8b26565e780eec377fbf647f4dcaa