Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6c8ceaf9004c58…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 21:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ec11d3d55abb201e741b8002c9a278c SHA-1: 8b4c22dba9447ef0228376b63dc1836caf58bb1a SHA-256: 0b6c8ceaf9004c580d9648e435c0c0e2db819ee862ec959af6ee7aaa23d28887
166 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to distribute malware. ClamAV and ML classifiers strongly indicate malicious intent, and the PDF_RANDOM_URL_LINK heuristic confirms the presence of suspicious external links. The file's structure and heuristics suggest it is used to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tartak-monis.pl/tartak/images/file/kosunuwab.pdf In PDF document text
    • http://asja.ua/userfiles/file/9562197324.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/pasedozusejumusukekegoxi.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-08-14-26-23-38.pdfIn PDF document text
    • http://ellev.fr/upload/files/lojaro.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/pekuburuw.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/52543240208.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/82582388670.pdfIn PDF document text
    • http://silver1979.com/upload/file/furulesolamopon.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/66407765990.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/18011569895.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/88234096710.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/13801162990.pdfIn PDF document text
    • http://bwc.lt/i/66918189986.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/81679186888.pdfIn PDF document text
    • http://protezas.lt/i/File/rivewuzuzuku.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/98105782841.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/95375766695.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/51774789445.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/9212970322.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/davafud.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/lewewefupebuzasabopobew.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/49a1702b7fc1895d8a3da506261b473c/26410331423.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210922142759702530u4mg3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=new+imoba+app+2021+updatePDF 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_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 17812 bytes
SHA-256: 47133c83a65b6518218a742684c7ccad6ee750de9aa761b8d3a646e9bd22376d
font_02_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 10732 bytes
SHA-256: 70d43edce18f6424b72270942a8d9be9daf9f1abaff108fd6cdc70af87ffdf4d