Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0a1ef267f99e4e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 21:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 895d79ed6ffae8fdd76637411ddd53d3 SHA-1: ca9e2034e1150eee61fea0b9d1b3f7a91b3f1d57 SHA-256: aa0a1ef267f99e4ef326d64d53b906802527bd7d7366cdcac952ee952573f2a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm designed to redirect users to potentially malicious sites. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=play+store+gta+4 PDF link annotation
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/dovedabinokasulefoz.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/monifus.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/buxabopusetok.pdfIn PDF document text
    • http://hbaoge.com/upload/files/54738375041.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85500237617.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/41354784550.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/80606466537.pdfIn PDF document text
    • http://hejia-ele.net/upload/sitozapowupopovexeb.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/vivowurosuviza.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/75038686764.pdfIn PDF document text
    • http://parfumland.sk/upl/bawibanoxaxoluv.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/fogunawerebemoxuvugofiwa.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/fenanajogulovodoxemal.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/8578687069.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/23153631581.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/48376465558.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6cd45348f4eb81874021a60fd6a07c33/83674114372.pdfIn PDF document text
    • http://medi-sen.com/files/files/suveno.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/xefadebir.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/farotop.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/89304957740.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8e2c0d2ad0747d49b1f9ba2d97baaed4/32073045404.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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 10280 bytes
SHA-256: eac4031851843a5c3a242033afd88683c51b3dd683c2347c6c905863f73db821
font_01_sfnt_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 17676 bytes
SHA-256: 085d40ae46c90a92fd9e9d1fe70a2538ca098f097fc20eb98d3448595e12d048

Open this report in the interactive analyzer, or submit your own file for analysis.