Malicious PDF — malware analysis report

Static analysis result for SHA-256 afeb5fb5430ba28b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-23 06:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1849acab6872873373871ff637632f4c SHA-1: 8470ed3eabd8a7c069642add2e90e54f0a1c5ce6 SHA-256: afeb5fb5430ba28b4d29ab381752355abd28dfe9da05360ee77c9104b4d33b89
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and one specifically containing 'install malware on android' in its UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://altus.pl/userfiles/file/80013483087.pdf In PDF document text
    • http://intelekt.biz/uploads/pages/files/jutabawewimo.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/81672215319.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/1237076670.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/solaforusubajuz.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/munonitabimuzi.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109072333539618.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/35132263382.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/23428151698.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/kudepakexif.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/nepew.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/42154940186.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/4554944732.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/91343177042.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/nigofodilukalab.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/86253788294.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/90897526274.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/33229901720.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/56313bd29b6633ab5d906081cb342665/jazogo.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/31210818645.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136269c89873---nakimikusutuviji.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/relev.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/ketisa.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/30174379020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=install+malware+on+androidPDF 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_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 17348 bytes
SHA-256: c5dd132b5f2f7df1845b3609844a1d6d2acb310257e67e2098bce9601a57934c
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 10444 bytes
SHA-256: 5ae928ac1c0e1d601b8173994fc0250633683e71bd49d774aa5ecbc1c98544f7