Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efbaf61f6a19a2a…

MALICIOUS

PDF

75.0 KB Created: 2021-01-13 14:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 93cc0a55b467638f60652419149887f3 SHA-1: deda96f26c795f13d0607e3496b1df95a291eda5 SHA-256: 3efbaf61f6a19a2ae8e56c984cafb108631a2fead2b60b9c6ab0903df5377ba7
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=biceps+brachii+pdf In PDF document text
    • https://site-1168114.mozfiles.com/files/1168114/viwusafivozifa.pdfIn PDF document text
    • https://site-1174882.mozfiles.com/files/1174882/bluetooth_disappeared_device_manager_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/7MJV8MK/murder_hornets_2020_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5ffe4a4b3692b.pdfIn PDF document text
    • https://fewurigog.weebly.com/uploads/1/3/0/9/130969621/7729425.pdfIn PDF document text
    • https://sajakuvidosub.weebly.com/uploads/1/3/4/4/134496924/sufogorikapef.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/49a780a.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/higcyih/demovunixunugava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_5fa5be29a153d.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/eihdvFg/kojijeralogaxabulige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xalasawu/becker_vtlf_250_vacuum_pump_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/71996083230.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/skies_of_war_2_hacked_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/60223115020.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/balantidiasis_caso_clinico.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_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 5400 bytes
SHA-256: 69a04ebd2808e63d1ac681fee4d74f3d78cff905fe89e95482354157bdf0dc3f
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 11788 bytes
SHA-256: 2ecab04f3da903c08eb8f2821e89b1e29923dd1d8fde08e0dc577d2a233abe47

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