Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0319939a5b39b57…

MALICIOUS

PDF

82.3 KB Created: 2021-03-23 19:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: aa3ef8c6102fc72a06529bcc3d62a444 SHA-1: c78a61077937e3af5d36da2048841cad87d92aa9 SHA-256: b0319939a5b39b57b77913e09e39f452d9df031158c2b9ed9c5aa2d62e9867f7
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, contains references to 'medical physiology masters programs' and a URL that appears to be a redirector. The presence of numerous embedded URLs, many pointing to disposable hosting, and the 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggest a social engineering attack aimed at tricking the user into downloading malicious content or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dafemum.ru/strik?utm_term=medical+physiology+masters+programs In PDF document text
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/d2ff95068d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_5fd7c0e50673e.pdfIn PDF document text
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/6504993.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/xeron.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417033/normal_5feb931579721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473954/normal_5fee844b058c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480591/normal_604a8804d4ea5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446930/normal_5fe08c192fd95.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/9575357.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/dosivuxumexug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494452/normal_60303bcb8ffa3.pdfIn PDF document text
    • http://zetomanebegox.iblogger.org/functional_programming_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372376/normal_5ff7af3047f83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5fe4e3a745720.pdfIn PDF document text
    • https://fafutetigav.weebly.com/uploads/1/3/0/7/130775448/836809.pdfIn PDF document text
    • http://kezekimoridim.22web.org/28683520171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://winenezufu.epizy.com/ccna_voice_free.pdfIn PDF document text
    • http://bofokagegawitap.rf.gd/list_of_german_nouns_with_gender.pdfIn PDF document text
    • http://xetemap.epizy.com/fevugobabixo.pdfIn PDF document text
    • http://bosajimebel.epizy.com/fadisoteloruvaje.pdfIn PDF document text
    • http://sexujojo.epizy.com/70593916498.pdfIn PDF document text
    • http://zorufuzelal.rf.gd/resuscitation_guidelines_drowning.pdfIn PDF document text
    • http://paritoxo.rf.gd/59132010837.pdfIn PDF document text
    • http://xojudemavu.onlinewebshop.net/rsa_algorithm_in_computer_network.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_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 5592 bytes
SHA-256: af8e33ca6c42d53e824de6f108676ecdac50286c7b97ce129ac0e4fa6260662b
font_01_sfnt_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 11128 bytes
SHA-256: 88fbeaeaed66899c1de011648e0788e859a385859319f01fc7893ae168871cf2

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