Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d3a2732f53c46c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 15:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c89810f4f4ee13264fe9331d02c2ab76 SHA-1: ef40df7509a32cfd9722ae14eeaaac2c9639a72a SHA-256: 45d3a2732f53c46cc1f19832a1e26d1abe74c125f67935e1f43d9ce47238280e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The presence of external URIs and the classification as a link farm suggest the document is designed to redirect users to harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://year-c.com/upload_fck/file/2021-9-4/20210904040449177207.pdf In PDF document text
    • https://fotojursa.cz/userfiles/file/22735584001.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/26188773056.pdfIn PDF document text
    • http://odumakus.com/uploads/files/26381872547.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161319b8a5e2d5---tuvirarusafijulonak.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/nomobibejavunolajuwulefaw.pdfIn PDF document text
    • http://industrialdevices.in/uploads/padananazovirisojobijunob.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/wexerofomiwipozasegiso.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090220571728396.pdfIn PDF document text
    • https://badoza.net/userfiles/file/bodajidivusogotepuxisu.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/gobusakisegazige.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/95113873780.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/1347000584.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/mabitezigewigedawafesebab.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/24324826124.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb7441ab36de62f4781d8c71a2b16686/woxolawabo.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ropupifixowef.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109040227061754.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/28184591192.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/gavelabiw.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/puzulazokivig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+amazing+spider+man+free+movie+onlinePDF 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_off0000dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 19104 bytes
SHA-256: 4ec986b71ec9bad4061342461fcac21974bc06ae50a91712c20ba4452a105915
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 10936 bytes
SHA-256: 57a2f828574c0b2dd3913be0b71cc6c7d54b9ef46017a8c4ce67b2470c08f42e

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