Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f0f119185d0978…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 11:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad35f681d38799542cf03db702b0a7a4 SHA-1: e02f68525b67e9ef7a264042f3c728fce206cf05 SHA-256: 93f0f119185d09781ae60821f918308946ffddb5e2128d15472594b598135f65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or credential harvesting campaign. The PDF structure and embedded links are indicative of a link farm used to obscure the final destination, a common tactic in phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://queure.ru/uplcv?utm_term=resignation+letter+for+real+estate+agent
    • https://snoman.mb.ca/ckfinder/userfiles/files/6660183729.pdf
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/fatiwuv.pdf
    • http://vivaibonomo.it/userfiles/files/63418265410.pdf
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68189273480.pdf
    • http://educasters.co/ckfinder/userfiles/files/53219309803.pdf
    • http://boschvietnam.com/files/usersfiles/files/77237549601.pdf
    • http://rehahomecare.com/upload/editor/files/jozakuxojipewa.pdf
    • http://queenart.kr/userData/board/file/98458365576.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614097221817d---47829267985.pdf
    • http://newcityhk.com/userfiles/82263347841.pdf
    • http://tao-oita.com/admin/upload_filesfile/sorozug.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143224c4c5c5---39655850022.pdf
    • http://metabolit-plus.ru/files/file/fibenejodifomepoloj.pdf
    • https://hankilfood.com/upfile/files/raguf.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/48209240345.pdf
    • https://pastelbuilders.com/userfiles/file/bapilinukikevatuje.pdf
    • https://autoprofi.ua/userfiles/file/devire.pdf
    • http://www.smpnuenen.nl/images/files/kesagexowelogerexax.pdf
    • http://aptekainternetowa.net/_mdm_apteki/file/kavalamebarekunajetawur.pdf
    • https://bloomland.com/sites/bloomland.com/files/rulemazadazo.pdf
    • https://livre-d-art.com/ckfinder/userfiles/files/datiwu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b168.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB168 16792 bytes
font_01_sfnt_off0000c97f.bin
b3187e7fa83ed406cb1442eb6d7d42d6aec7b165c186e7e488cf88fc5d64b362		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 10436 bytes
font_02_sfnt_off0000e14f.bin
69f8fdb459213ab5b50f42110e77c055f53f01c15cb392aca640c84b363de4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 18084 bytes

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