Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c537c0f79c6c16b…

MALICIOUS

PDF

81.3 KB Created: 2021-02-20 00:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0f9a7fbe294248917cb8a7fd5162cd80 SHA-1: f22e70bd5bf7e924b65f696a0100bc9159700a0f SHA-256: 0c537c0f79c6c16baf46491417245e3ae9b878694622acc3eb4938ba25c9acd6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a 'hospital infection control manual', likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/wix?keyword=hospital+infection+control+manual+for+small+healthcare+organizations In PDF document text
    • http://health-top.ru/takuzeseranixixesogadom27m8.pdfIn PDF document text
    • http://xigulomu.iblogger.org/dunkin_small_caramel_iced_coffee_with_almond_milk_calories.pdfIn PDF document text
    • http://zavemobavozake.22web.org/hospitality_management_internship_report_sample.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/aef7f.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/pivavet.pdfIn PDF document text
    • http://portkamesto.site/grammar_handbook_for_middle_schoolfwjgl.pdfIn PDF document text
    • http://byt-upak.ru/mukablcdmx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://karerob.epizy.com/gefudoditorunaz.pdfIn PDF document text
    • http://bafuxinasu.epizy.com/certificate_format_pem.pdfIn PDF document text
    • http://jaxages.epizy.com/55624730685.pdfIn PDF document text
    • http://fomuzuzidoduvi.epizy.com/32061273666.pdfIn PDF document text
    • http://zivuneko.epizy.com/45728848691.pdfIn PDF document text
    • http://ropanosuge.rf.gd/html_form_default_submit_button_enter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 5324 bytes
SHA-256: 36590a9ef05e66343947cdac4d3130c36975c9515a919848aa17a1dc035ef6df
font_01_sfnt_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 11388 bytes
SHA-256: c723de5024ead83741ee46ce81e7bcd00254ab2f0d05bafd7cac10e242a881fd
font_02_sfnt_off00012960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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