Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f46b1112886dcb…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 09:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b7a69111a0ba25f22ec6b88f54ad4634 SHA-1: 58fdec1474ed9f6803e8a8594992c79d6c3a4bc2 SHA-256: e4f46b1112886dcb949565120429eda364d500c68f8b1fdc5764c28374219232
174 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate the presence of embedded JavaScript and external URIs, with a specific rule firing for a 'Payment redirection / bank-detail change lure'. This suggests the document is designed to trick users into revealing financial information or initiating fraudulent transactions. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • 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://fine-cottage.ru/userfiles/files/59370536814.pdf In PDF document text
    • https://privatecambodiatour.com/userfiles/file/3152072388.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/31355418201.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/nexigetipojaror.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/ruzowali.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/fuzuno.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109180751126807.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/sugagedevipu.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/46055980061.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/3571044767.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/foxafes.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/fagujaxegisomikotafifub.pdfIn PDF document text
    • https://latework.cz/soubory/92604760088.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/mitavopeloxikenudojosel.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/75545512907.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/34316928863.pdfIn PDF document text
    • http://krupongs.com/images/file/sejagubep.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/27953263272.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/44037878263.pdfIn PDF document text
    • http://abwrva.com/uploads/files/xujamed.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138875bcf0f0---maguxusirozogoxibejamas.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/wizidewuniwekaxojig.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/53418142237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=adobe+premiere+rush+mod+apk+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_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 10932 bytes
SHA-256: 9418ee9b1b503a5e4a1ff96ad9e6871c48fdb4f133632d0c2e173d95b119c2c4
font_01_sfnt_off00010094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A6 18004 bytes
SHA-256: ba271bb57088cc65e185f2fb9987274784ee80d84c0109592865ccc954f783f4