Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6a150860e740db…

MALICIOUS

PDF

79.0 KB Created: 2021-09-23 01:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7e1949fa1b1f7ef1f481e696d94f8e96 SHA-1: 9b5d5ef053fbd75a9a4be2e1626e4d3345529c6e SHA-256: 2f6a150860e740db39f8f69c86624aeb63e7cd992e5dd8bfcc5bfdf75e15f864
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are disguised as file downloads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://laborke.ru/uplcv?utm_term=bleach+eternal+soul+apk PDF link annotation
    • https://milorem-service.ru/userfiles/file/55471902819.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/medanuxanutobepa.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/95620277812.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/65127527900.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/bukuvobijirametoz.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/10304673419.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/makugigopo.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/suzadigofuxufenoziwuwu.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/40252487623.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/mosuximo.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/xevukexarumumuxasosi.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/40443459616.pdfIn PDF document text
    • http://mextro.de/upload/files/domixopet.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134343ff2a34---26341081284.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/1773050254.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/74894462690.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/31066447529.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161419f1aecb9c---gudeketobopesudu.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/69267238329.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/13297660489.pdfIn PDF document text
    • http://iknow.pl/files/file/97963711027.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/ninoju.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210908223320.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/72336279727.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/zudageb.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdIn 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_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 17728 bytes
SHA-256: b5f748915b55004d5f99c36267a557692d01b5b29f92d6ef90c3929f440f8ea2
font_01_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 10624 bytes
SHA-256: 09937e2e5aba6610d2dec13dae3172f8107c9fd82d0ec7effc62c746ea94755f

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