Malicious PDF — malware analysis report

Static analysis result for SHA-256 9780cbdc38955aaf…

MALICIOUS

PDF

77.7 KB Created: 2021-09-22 15:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9cc4257bd83c0b785748ff48ceacb0a8 SHA-1: 24353591b89a43fc82873efadbdd96124f7b3a10 SHA-256: 9780cbdc38955aafdf53b3f3a7bb2136fc9b9056e229b1bbd282afcafd592b1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to multiple external PDF files. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ead382a1---29794497659.pdf In PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/senawino.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/37515961163.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/welasomidezivedivesobam.pdfIn PDF document text
    • https://agrando.cz/files/file/kusofaxigufeferukemezilo.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/pimidijose.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/73132460025.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/newipusogowuwavipesi.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/petakozenidagalamizo.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/lavumifexom.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/96986136228.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/76028250526.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/mepejetawosenuworeban.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/geluzoxatabopibolux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=episode+free+gems+and+passes+without+human+verificationPDF link annotation
    • https://mediaget.com/userfiles/files/pobuzofumifebes.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://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_off0000c844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 11256 bytes
SHA-256: cea01556c8c591870f8ebae3317c319d5ddcbce57e7e17c45dbbba81160a9423
font_02_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 18112 bytes
SHA-256: d915160db3ffac03de00b9bc05db38e9161047b3034fd1288480ebb0a0291379

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