Malicious PDF — malware analysis report

Static analysis result for SHA-256 859f4dc40f77526c…

MALICIOUS

PDF

83.6 KB Created: 2021-02-25 19:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ec567a4d028e0308731b938933824303 SHA-1: adb41f66d194241e37c64074e34edf42481478cc SHA-256: 859f4dc40f77526c4069d375084fc8c647b8cc8c280f026bd283811218813464
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or scam operation. The document body, though obfuscated, contains text related to persuasive speech, likely a lure to encourage users to click on 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
  • 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://bologen.ru/123?utm_term=three+types+of+claims+in+persuasive+speech PDF link annotation
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/jekaromesekan.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/ey8jeiL/my_proxy_server_address_and_port_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_602999bc5f2d3.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/4379249.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/how_to_persuade.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/81524099713.pdfIn PDF document text
    • https://waniritapi.weebly.com/uploads/1/3/0/7/130739375/wopigidilakogut-lazibo-xemukunogo.pdfIn PDF document text
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/6926975.pdfIn PDF document text
    • http://piroluzufu.iblogger.org/joxezibolufopofanugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bomepexajusopa.epizy.com/91347462018.pdfIn PDF document text
    • http://peronilekovo.rf.gd/free_templates_for_40th_birthday_invitations.pdfIn PDF document text
    • http://zuparupafedi.epizy.com/22537470759.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_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 5364 bytes
SHA-256: 2eb00f6d39becc907f3195e2b1b515c2d49f3ca89856254fc1538ba1be5d01e5
font_01_sfnt_off00011e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 10160 bytes
SHA-256: a0a0a65d8a0abe30e9551a2893509452e8548a77c4d635784839d66cc5486c30

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