Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a750ad6b7b750d…

MALICIOUS

PDF

74.7 KB Created: 2021-04-03 11:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd219057b30716cb5a3b24c53cf5b347 SHA-1: 1a919a8a0beb8cd542ecba89537069f3ae9c3f65 SHA-256: c9a750ad6b7b750de288e922ace83c7a82dc0f86c8780ab1906c7d49929cc3d4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to facilitate initial access, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/wix?keyword=defend+your+nuts+1
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/ec68b8c9c874469.pdf
    • http://sakulog.sportsontheweb.net/allison_1000_transmission_manual.pdf
    • https://tunajixawovu.weebly.com/uploads/1/3/0/8/130873758/putivudi-runapogolo-vegiwi-lovasanuvodafol.pdf
    • https://cdn-cms.f-static.net/uploads/4463792/normal_6027453eb378e.pdf
    • https://cdn-cms.f-static.net/uploads/4487192/normal_6034fe6de4036.pdf
    • http://datovufes.scienceontheweb.net/22925971313.pdf
    • http://turoxolu.iblogger.org/17694552150.pdf
    • http://penaleduduzib.iblogger.org/xoxegifeketiselavim.pdf
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/912383bce2.pdf
    • https://cdn-cms.f-static.net/uploads/4501659/normal_600cee2d4356d.pdf
    • https://static.s123-cdn-static.com/uploads/4414849/normal_6001145ace8f1.pdf
    • http://siwupezomejen.getenjoyment.net/3419820251.pdf
    • http://gopudumimipabol.mypressonline.com/47745918325.pdf
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/385347.pdf
    • https://static.s123-cdn-static.com/uploads/4477638/normal_5fe1a83cb9127.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://lumalidik.atwebpages.com/inductive_and_deductive_reasoning_quiz.pdf
    • http://dapilejebuvone.atwebpages.com/7902316654.pdf
    • http://japuxizikaroviv.rf.gd/pan_baidu_er_chrome.pdf
    • http://sisejarozig.epizy.com/bhagavad_gita_made_easy_english.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd6.bin
b61ea85d64ec469e15fbade982e3bc5ea4b82cd028f19088fd794c3953342c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 4812 bytes
font_01_sfnt_off0000de55.bin
b499f788710857061bf84f222f068c63c3eea1c51db3d28aa3dbaccba3512b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 10284 bytes
font_02_sfnt_off0000fb43.bin
0808cef68cb193de39446984742a3e211cfeffb660686c3a05e27b5898587902		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 10044 bytes

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