Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacb97a2d8a0efbb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 08:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 972f1b089b46e9ac7e31ce613e7ef127 SHA-1: 5d75e0510170c067d8f5c521d99a13e42ee76ca5 SHA-256: aacb97a2d8a0efbb06aafd9404780391a77a53f3c06ac8639cb955f4de35999e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to download malware or engage in phishing activities. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://catamma.ru/uplcv?utm_term=mp3+skulls+free+download+for+android PDF link annotation
    • http://mc-opony.pl/files/file/morenejifabofabezukikewox.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/lajijifusorozarevegunawi.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/49316309230.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210916_86097A40339B9BA5.pdfIn PDF document text
    • https://vigilanciaweb.cl/dinamicos/files/file/78087763166.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/dirabetapevakivimizared.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/50522531488.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/mawuxur.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/87882992555.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/wuwaxopitogejekato.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/40079083744.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/27448430541.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ri7akpb0veu4ca9dcgq60pufd2/papivulinesesesumekimixi.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/16547571217.pdfIn PDF document text
    • http://licausi.it/userfiles/files/tevipiwanefuwimobuvor.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/jizerul.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/pixadabinad.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/kigadixonipetuv.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/jeduxigibowo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613730b91e48c---433173204.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/57054345582.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/47864539067.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210911065226.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/xaduwivodup.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/86043711791.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/gofikupigo.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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 10836 bytes
SHA-256: 7e8a8ef6f67f2ad6e86288c8a98f098363199887f8b8d5d745c76e1130ef836a
font_01_sfnt_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 17820 bytes
SHA-256: 55141b78188921039fd9a1e2fdf04cf5f4a13b8a72f87ab03ee8dfce0c7267d3
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1