Malicious PDF — malware analysis report

Static analysis result for SHA-256 7589425a9c1d181e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 11:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 126a9cf622d9c1b7cf000c9e99f79818 SHA-1: 7d9544b031b9b22f63470a287477332472369800 SHA-256: 7589425a9c1d181e45a29a864aa3eb577bec909a94b656c8419e55588b21012c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--nellieskche-0hb.de/userfiles/file/82407638592.pdf In PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/69515647198.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/lerimajebufowokilerumi.pdfIn PDF document text
    • http://anpharma.net/upload/files/56188379702.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/pumomagikekexinijo.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/66143708650.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/70404808698.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/zuvimesiduvemo.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/jezavetutoxiputog.pdfIn PDF document text
    • http://exima.kr/userData/board/file/zudodamurixezed.pdfIn PDF document text
    • http://prestopc.it/upload/file/xazilona.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/fubidopudafujakum.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/16066943387.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/kumaxuru.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/36087977701.pdfIn PDF document text
    • https://mollis.rs/files/2061114363.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/xilirazixoxatatojidujape.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1632521575.pdfIn PDF document text
    • https://webrobogo.hu/kepek/wofudejusunejumexanep.pdfIn PDF document text
    • http://hotechike.com/files/files/jewanoteremifejuz.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/7041277803.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///41793489866.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/korizobivi.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/17564377256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dragon+ball+super+free+dubbedPDF 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_off0000afb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB6 17424 bytes
SHA-256: 31804c1cd33a9b4bc73433e1d036c9bd29fe53d8bc4bfe28c924c66c9215249e
font_01_sfnt_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 10724 bytes
SHA-256: 7c6057811a48ba41ca54236949f640381a373e64af57903fa6cf10d400f1e7cf
font_02_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1