Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bac008f3289fe02…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 17:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f383decf5f8f90683d8d16aa11816ff SHA-1: 613bdd4f31bf89a59e23e4fa4533940a570d5364 SHA-256: 3bac008f3289fe02a1e8e41fe11484a3ecbcefefee1b04a2b69bd41935a8ee04
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed to redirect users to external sites. While no scripts were explicitly extracted, the nature of the embedded links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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 https://pixomot.ru/uplcv?utm_term=best+fortnite+creative+maps+deathrun PDF link annotation
    • https://pacantioquia.org/aym_image/files/sesekakubuzuxibuxujim.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///73483337448.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/i3dvanub9an3qu3fs84flh4pv0/49502971130.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210911_ED7CD114E32D248A.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/62426108123.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/71376809422.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/75788277705.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/terukejexuxumetokokagize.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/53568246046.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/77968398748.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/87914639642.pdfIn PDF document text
    • http://steinemann-ag.ru/femegelagewuzifemisuteses.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/69367136446.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/wadumobufarelirimi.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/kanaximokodusoxe.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/38050950630.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/wugabusirexikozenazuzuja.pdfIn PDF document text
    • http://youil.org/userData/board/file/dowuturabufirofajasav.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kepakenu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5f7no3q7abqt48htbamd1nsrh2/zosap.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/rizojub.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/naferop.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/91263911977.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gorexoregimoxuju.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/68535062023.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_off0000be85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE85 16784 bytes
SHA-256: 418ed365690ff2ba332b1c3183b15e0f44cd4f27e951869299a6311d8548b1de
font_01_sfnt_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 11056 bytes
SHA-256: 51c61a52c11e40dbbf9126df4d5e8230489de74dd5335816c0b3dc2d31e41bb8
font_02_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1