Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92e262b30622c01…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 09:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 875177cca51fb1fb354133443a7fdb66 SHA-1: 800c549a4d7e4d638172ff4930259c03e52bc5a3 SHA-256: c92e262b30622c01d5ce666a4876f22e62c19d63ff43d2266269b8942c608953
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://komunalno.vrgorac.hr/files/4736695373.pdf In PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/51552984852.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/60451729092.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161395c773362f---6110982132.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/81406841399.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/genokujutafufupajire.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/jekuzavewenefolalopavox.pdfIn PDF document text
    • https://digireg.dk/upload/8105238637.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/rutokinunulutasutosub.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nosofadedipopelupire.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/63945389479.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/28582973768.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/31940629718.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/55061709645.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/wixabakasevesozen.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210914_C7861AE5FD5BDB4B.pdfIn PDF document text
    • https://2winit.com/Files/files/dulunagoxopamuxijexub.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/11199225309.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/zejaxuvokukelulemimus.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/62765393750.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/59919869243.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/rigulavewunanefolafipepur.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jum28ldp06ed1cdkno1ve5a4t1/piwifazizeve.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/fuwovekuxofemitoteponujik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+format+a+letter+envelopePDF link annotation
    • 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_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 15884 bytes
SHA-256: 2c8bfd0a98c6e41b9d8efa0fb059f40159b2655152669e5a115c4a343fe39254
font_01_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 10400 bytes
SHA-256: d8306b50c8502430165ceff2b53e08cc7a890528f2ff3ba9d5e5150dd448b7e7
font_02_sfnt_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1