Malicious PDF — malware analysis report

Static analysis result for SHA-256 83875e84b8cb5ab1…

MALICIOUS

PDF

76.8 KB Created: 2021-02-26 21:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c36717daf2197aa47a4efbe11cd44ae3 SHA-1: a103dad0e1c34b8efd43bfecb512f5e83d28b20c SHA-256: 83875e84b8cb5ab1b9ed70b1fd317fb1dccf142a3f55d9d465c4dd93bfe48d39
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing malware or phishing credentials. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=how+to+be+a+creative+photographer PDF link annotation
    • https://cdn.sqhk.co/fobonelaga/ghahaGS/657021265.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/python_add_authorization_header.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/broadcom_ush_driver_e6520.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/75517035939.pdfIn PDF document text
    • http://artdebug.site/ponagefijivilatitujivzq3eq.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/d37ifgg/five_ten_freerider_eps_high_mountain_bike_shoes.pdfIn PDF document text
    • http://accface.in/wii_operations_manual_for_troubleshootinguc4ct.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/what_does_physical_stamina_mean.pdfIn PDF document text
    • https://raxelapanaf.weebly.com/uploads/1/3/4/7/134746791/rotutu.pdfIn PDF document text
    • http://brettlockhart.com/bigo_live_connector_for_ioscjg53.pdfIn PDF document text
    • http://dayzcommunity.info/how_would_you_describe_a_coniferous_forest_cover76jkf.pdfIn PDF document text
    • https://xokaxopo.weebly.com/uploads/1/3/2/3/132302824/vigelebumixubek.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/1d6e6c672.pdfIn PDF document text
    • http://mxbur.fun/576430633293vb6w.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_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 5236 bytes
SHA-256: 913253da0588fffb680b314a2ddd9b752518081dd86f161740a148c38a106373
font_01_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 10592 bytes
SHA-256: 9875d9fe6e8c3aabab4a9cf0cec301036770531648f9100b2fa6a9fa7dcca62c

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