Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36a2ef59146ea60…

MALICIOUS

PDF

77.2 KB Created: 2021-02-22 00:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 16a820952ffee57cbfeed050b579208c SHA-1: c68bf074aea8c4097bdaba568a2c3252b9b2d1f5 SHA-256: c36a2ef59146ea60d4bb8cf4fe713b3a6b484cbb137b0e16d16ae95916fcf61d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'Medical surgical nursing 9th edition used' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to disguise malicious links. Numerous external URIs were extracted, many hosted on disposable domains, indicating a link farm or redirection scheme to deliver a payload or phish for credentials.

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://druttle.ru/123?utm_term=medical+surgical+nursing+9th+edition+used PDF link annotation
    • http://baby-slings.ru/brief_formaat_nederlandaobqh.pdfIn PDF document text
    • http://matanusebatug.22web.org/gaxadeparivilovofirafa.pdfIn PDF document text
    • https://majuxakitififez.weebly.com/uploads/1/3/0/7/130738909/d7468.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/38331821935kmu4z.pdfIn PDF document text
    • http://wiregabjuk.fun/kofewotiwamugtd03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_5fe8d4367a2ad.pdfIn PDF document text
    • http://usecabinets.xyz/blue_skies_irving_berlin_piano_sheet_musicpzp97.pdfIn PDF document text
    • http://biweekamnf.com/african_animal_symbols_and_meanings661ws.pdfIn PDF document text
    • http://naturalm.space/45436839474ep5kq.pdfIn PDF document text
    • http://sq11mini.com/aggiornamento_android_lge2kif.pdfIn PDF document text
    • http://123dutch.com/witubam4wxv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/88512735988.pdfIn PDF document text
    • http://fasilew.epizy.com/midepugomajo.pdfIn PDF document text
    • http://jikusipuxojapu.epizy.com/s_tecappvault_2015_caesium_image_compressor_free.pdfIn PDF document text
    • http://wemikovovafebo.epizy.com/wipepi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 5360 bytes
SHA-256: f7dc512a66a1df5d4dde6e94aa7bf6fc6921f4040ba585a66cc577f119afa2c5
font_01_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 10436 bytes
SHA-256: 35881a57fb8baad8741a4ca91bba86c3517450be0cf2c365134f03cb728a10a1
font_02_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 16076 bytes
SHA-256: 9352d416d3fc38e0cde715a6fbdb9492e961298b7af78ef2a950ce7bf6ec641e

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