Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f31e6cfc932629…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 02:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4c5c5c95594a7ec1ddf7c755af185473 SHA-1: 20a27bb05edb47410679b0d776faad113df1c270 SHA-256: a2f31e6cfc9326299ca45a18ea2f74b9f22e82b56abc6f8e6087c88da1c480ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm and potential phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download and execution of a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://dienmaythanglong.org/uploads/files/nofigolofugexibibufomuve.pdf In PDF document text
    • http://beiwendq.com/data/attachment/file/23991726338.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///53386993957.pdfIn PDF document text
    • http://synphabase.ch/upload/file/balobaketapetu.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/saruzepokepo.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/zagejufikarasekiweda.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/ronamozosabaru.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/84220697307.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-13/images/files/nabisokorofajuvedipe.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/nisefinakogiposiv.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/lasanapupijepigurotuki.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/kosasonanatemodinubepito.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/91326828226.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/dibigewixa.pdfIn PDF document text
    • http://prmakeup.com/Image/files/nusefalivenagafage.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/64350197836.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/30071264755.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210914075240.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/betizinaziw.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/14315748583.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/vapinivige.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/90401781297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=super+mario+crossover+download+for+androidPDF 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_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 11008 bytes
SHA-256: cf2dbabfcfb36444976893095325729846c0bd088179842fbaa4118ff9e151ff
font_01_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 17184 bytes
SHA-256: 4e8f21e866d864c83645c67bfdc680d5074cd1cdca9446a05234ed0ad062da7b
font_02_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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