Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0577f2d9b43f66…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 08:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9352280e86f8987de9da19ef26e8ba8e SHA-1: 34e784860e92d8fa22fffd4efbd961414a130dfe SHA-256: ee0577f2d9b43f66cbb5f5426b759416bf84ba41bb34a3d2c513da825df929a2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a high-severity heuristic indicating it's a password-protected archive lure. This suggests the document is designed to trick the user into downloading and decrypting a subsequent payload. While no scripts were directly extracted, the PDF structure and numerous embedded URLs pointing to potentially malicious files indicate a downloader or dropper functionality, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://epwuae.com/userfiles/file/24187271614.pdf In PDF document text
    • https://kolegium.inaheart.org/upload/files/24139076308.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/zomasizupu.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/46718985948.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/86921363485.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/46814581286.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/51684287799.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/merawexawalatexus.pdfIn PDF document text
    • https://nomortiga.com/contents/files/xamevevigo.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/42342701419.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/sorekafadurubisabesivop.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/lozijokuzoxutuz.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109080033477741.pdfIn PDF document text
    • http://wdnederland.nl/file/94715879467.pdfIn PDF document text
    • https://suksesunited.com/contents/files/46115188198.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/megoweveso.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/kuwujotafiw.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/rimodilixoraxiregilager.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/rojogutuso.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/83808623915.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/debegojagu.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/75577394348.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/wevajawazad.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/26673507859.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/833bc32df6a41651fbf491e1f8731380/69834246164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=como+ver+mi+clave+wifi+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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 20976 bytes
SHA-256: f90ecd6ddde4f55456b194004c9dd02f7061f6e9c3c0b34373a77732cc31feb3
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 10556 bytes
SHA-256: 7fc1b87e3969766a0011a8533e5b284f6d25772f8b3072d8d9a4272e1e43af13
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1