Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2619a7ac6e5c92…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 00:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6c5257ba3f3200bb28d11a0ab1f4291 SHA-1: efa1a918d3f8f511f9c133cc480dd70e43124288 SHA-256: ac2619a7ac6e5c9236bba9d224da53ef80845f92c065aa1d0a5854516513a07e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination or spread malicious links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gospel-streams.com/asset/ckfinder/userfiles/files/nezam.pdf In PDF document text
    • https://girilawfirm.com/content_files/files/fojezurixew.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210910/files/20210910050723.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2ca77dbd4e54814e8957b09179a94339/ponorowemef.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/sajusivirutunixibimawa.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/714370881.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/19431363073.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390a6699613---nutonagu.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/rudexinizanuketamizuda.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5f427541---26484224134.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fukovigefekedasiji.pdfIn PDF document text
    • http://innotack.com/userfiles/files/868044285.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rurakowufeganaxuxubaxepun.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/kunofefivurenirogej.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/41688591607.pdfIn PDF document text
    • https://basisnomor.com/contents/files/sivajakaratekonuzi.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/rabujitumema.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/96138857958.pdfIn PDF document text
    • https://ibericadearmerias.com/file/gijajafafuratifekegev.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/kogolomuriz.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210909_185019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ebook+excel+pdfPDF 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_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 17580 bytes
SHA-256: fb70848f392469b23fc61002738b97462d602fe63010d6dd232808068374ba5a
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 10204 bytes
SHA-256: 4d665f5ee276039412bdcf926038823d0377b417ed9e3af5e0264cf75c63c4c4
font_02_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.