Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8548842cc9af415…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 12:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd3d798bbf335a3d01893e284906b6ad SHA-1: 3c982beec5f4c2e7e4665b69a2ff804a2f895486 SHA-256: e8548842cc9af415a57d1828e377b72528cabe9c9dfa8d974692f8c837c661cd
226 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it is a lure for payment redirection or recovery secret requests, suggesting a business email compromise attack. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt to steal financial information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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://krossi.ru/images/content/files/sitomitojipumodekidabonid.pdf In PDF document text
    • http://heydarbaba.org/resimler/files/pefuwatajubowixexurivin.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/kilelejasewopusozepib.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/xujexaworepup.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/59944331484.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/9465996668.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/notudi.pdfIn PDF document text
    • http://lovesenergy.com/file/luxulazurakalofitimeda.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/kibugajunatotufu.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/konubawimemu.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/gapakumuxikotoxerofatig.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/beferubumixepuxuni.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/vufetoxi.pdfIn PDF document text
    • http://safarang.com/basefile/files/55631167966.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/67192306345.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/54388265292.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/93612533027.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///54988377502.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/10769094496.pdfIn PDF document text
    • http://clingac.com/d/files/49482617164.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/relubolojunoluwe.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/vagajovupefipuloraxu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a82226158357ee50d8e8212e2f0581b/kepunan.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/zagoxapimujukapobesiri.pdfIn PDF document text
    • https://///https:/-jira.spring.io/Browse/Spr-14651In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+sftp+client+examplePDF 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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 18928 bytes
SHA-256: 28c7624bca1d96a4f83a5dd5cb336987524a5e069bf87c7c4f05de1bae13d0b7
font_01_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 10864 bytes
SHA-256: ca6975821468e7d1407cba30261d7e5f100f7cf8c266506aae66f2ee37d67eb9