Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c9b91de3d73027…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 10:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d15fd33c2be065d437287de556144ba7 SHA-1: 8673d4e67e7fac0097e5f9de8fba1667499db11e SHA-256: e1c9b91de3d730278162d59eb47543912674df3a586bd11d0acdc868e08acb4e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ladyvenus.it/userfiles/files/lirekevigumewifovafo.pdf In PDF document text
    • http://contrast.no/ckfinder/userfiles/files/22453937741.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109090730151600.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/71657231010.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/wefurezekiz.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/57413539474.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/medotebojopujufowasom.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/27012652243.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/muzapusazepefetojuda.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/46868383693.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/jatol.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/jovezejowojuwune.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/rajozekefu.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/jikofisivowowepag.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/foroporexutut.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/zolizenejelolig.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/31339632717.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb1ec5feb0---tufowagov.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb4c2bc89---78950474709.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210911235247.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/73102943276.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/11127322914.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/56565277025.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/kizugofijeminenojatum.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/kofiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=koisuru+boukun+manga+download+pdfPDF 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_off0000b329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB329 16676 bytes
SHA-256: e7c7a9d684659f9208e6d5ddbee7ef9f8c71809c3fb62ad3e7ed9d3f55356918
font_01_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 11020 bytes
SHA-256: 4a28171d20fde743dce2cf7909509b146d64d90c4914d4b051567fb7918c09b2