Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba28454bf9da5942…

MALICIOUS

PDF

70.8 KB Created: 2021-01-25 14:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 32fc8a9ab815ad42d8755d20ed9b4a3c SHA-1: 760117d3ca30150c8abfd7a6d888b92f9e14c2cf SHA-256: ba28454bf9da59420471dd74557c743de0d0b1ecae09431644ee718785da0353
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, and contains a large number of embedded links pointing to external sites. The primary link directs to 'https://yafferge.ru/', which is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to educational content, likely a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

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
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=how+to+get+a+fraction+on+a+ti-84+plus+c In PDF document text
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5ff616a912274.pdfIn PDF document text
    • https://bawobejeburojax.weebly.com/uploads/1/3/1/1/131163695/ced18838f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369503/normal_60059781e40b0.pdfIn PDF document text
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/9802342.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxifopu/FjcicuW/5951834470.pdfIn PDF document text
    • https://japugaze.weebly.com/uploads/1/3/5/2/135295186/595cb102124705.pdfIn PDF document text
    • https://cdn.sqhk.co/latipizi/SIYXTta/81905134107.pdfIn PDF document text
    • https://zesalogerevuj.weebly.com/uploads/1/3/4/6/134684883/4780468.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/xuziv-setemademilula.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/geviralotafufenuli.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/XNMaYhh/93538352336.pdfIn PDF document text
    • https://xidekudogigut.weebly.com/uploads/1/3/4/6/134683706/xinotipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_5ff565b118a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_600e9e888b1f2.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/tonav.pdfIn PDF document text
    • https://cdn.sqhk.co/timemowab/hihhij1/watch_shelter_movie_online_free.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_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 5552 bytes
SHA-256: ba4dffcd9567227dcbba14d7ffd6351e152e39f1a82f0e78dabdd9b18411a5e3
font_01_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 11032 bytes
SHA-256: 6980fbd516e428f07e78220027b1ea85efec6c672a4731b7a03efccf61e754ba

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