Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bce5d12def8554…

MALICIOUS

PDF

79.6 KB Created: 2021-03-28 13:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 46a57d2c4a6bc19c3009bcdea7da2085 SHA-1: ccb50fc15bf2b1490dde858b810f4bfa90e00571 SHA-256: 63bce5d12def85541f16f0f6859ca031085e4036b55d7016cbd2b1431ce03e1a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://leonvi.ru/strik?utm_term=nora+roberts+year+one+tv+series, appears to be a redirector, likely leading to malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm heuristic strongly suggest its purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=nora+roberts+year+one+tv+series PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476294/normal_6047fa1983de7.pdfIn PDF document text
    • https://cdn.sqhk.co/rodofusavivi/gjhaifI/eau_guidelines_prostate_cancer_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/mujetujojen/PfgdhaQ/rojajakumatuwiko.pdfIn PDF document text
    • https://farevilifowo.weebly.com/uploads/1/3/5/3/135390938/64ac2b152a4f.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/5054067.pdfIn PDF document text
    • https://ganoworot.weebly.com/uploads/1/3/4/2/134236177/8d840b7b2aa2320.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/el_libro_secreto_de_daniel_torres_resumenyo3o7.pdfIn PDF document text
    • https://cdn.sqhk.co/wekajibex/hdSgh8M/10918629809.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/yZggghs/8492967280.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392442/normal_5fef183587585.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/RKRifIi/battery_charger_12v_amazon.pdfIn PDF document text
    • http://icub.tech/hp_realtek_audio_driver_windows_10_2004ctjfc.pdfIn PDF document text
    • https://duxujemiw.weebly.com/uploads/1/3/4/7/134743688/9907327.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/jOUgfhh/dowubezobatebadokelaxela.pdfIn PDF document text
    • https://cdn.sqhk.co/nibijegun/Xsfhsid/2972104928.pdfIn PDF document text
    • https://tefizaset.weebly.com/uploads/1/3/4/5/134587169/f80be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_601959c155737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483388/normal_6000b4039486e.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/lozadaveburosoviluja.pdfIn PDF document text
    • https://vodemiteju.weebly.com/uploads/1/3/4/7/134722100/kiguravis.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/4598566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 4920 bytes
SHA-256: b75a9097a36152381879e5551dedf24eb3ab874d8eb91d8f1f419c0f9f615eab
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 12476 bytes
SHA-256: 0073e7aebd9f7e91703870ada8c331ebe35d8224a73ceb53e779bbcd500d8eae