Malicious PDF — malware analysis report

Static analysis result for SHA-256 896409d5316a67ea…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 14:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0af9262a872b1f5d2d2862a1785bdd82 SHA-1: af1f9801ad481641848e543eabfc2186d4a790ce SHA-256: 896409d5316a67ea9488d3dc43a772863f8cb371920f88c82f604cc814286208
186 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains multiple heuristics indicating it's a link farm designed for phishing, specifically a payment redirection lure. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly suggest an attempt to redirect users to malicious sites for financial gain. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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
  • 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://zhansq.cn/upload/file/jipoxeropapokizuvigamo.pdf In PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/dutibapiguxejepatusolidig.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/metazadefirupimolelajurul.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/43976279438.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/bevumodevagadazidiredu.pdfIn PDF document text
    • http://tayles.com/uploaded/wowejositowuxabugevis.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/solasavisi.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/64060001612.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/18472277282.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ae489596---99552146034.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/58725673234.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/53188673047.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/figupirejulatuzunok.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/87965009619.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lujuzufopejaledavasap.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/71042402035.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e264401c16---sulijuren.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/64576829276.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/penuvapotok.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/56855778526.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/57917913094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=exmail+outlook+sign+inPDF 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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 10496 bytes
SHA-256: a1e359f4bfab303af3908186a40fe43b3457e3c9af9897bf4acf48434384da74
font_01_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 17976 bytes
SHA-256: a4e4fdde83bd5eca61eba9fdf58fd439bc99dccb79283442e1d955ab033a9633
font_02_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1