Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb03d075f8913aa…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 14:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6109143cb8add0ed7bcf43c39a5080e1 SHA-1: f316fc2bc1d38605d37560d5109a3e4e1f75f96a SHA-256: 2eb03d075f8913aae5847e58dd0bb643922f2508966a9ec0c19df3909d3cb680
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://worldtile.net/jangheung/userfiles/file/47980046971.pdf In PDF document text
    • http://chinajnbt.com/images/upload/File/sutokalenonawodija.pdfIn PDF document text
    • http://unseretochter.ch/images/file/77104286717.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/jasowezakoburexibemizal.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/nakudenabarem.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/35260543154.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fe52eb83---1048409532.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/56275870074.pdfIn PDF document text
    • http://chongros.com/userData/board/file/somabowekin.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/tinigifetiz.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/jipofapusa.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/67693691505.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/xazumokamikinokabej.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/nuwemozuloki.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/18151645378.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68664352900.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/uf7nht6og3r6mua1mjtt4amsm1/zogakezavi.pdfIn PDF document text
    • https://il-gusto.com/images/file/jezenijafupuxijun.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/norigikikasovuperej.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/doxebema.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/naxixib.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/tawenokekitiwapetawo.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/loganurokagi.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/davegakikagoledumutu.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/tulivuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=puffin+os+phonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 2156 bytes
SHA-256: 80ab4c3bf1ce1c0196b529a8aa194f57dec117b62dd7d4f7019b0d7f6a71a93a
font_01_sfnt_off0000c8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 18072 bytes
SHA-256: 0e1936e060952f9f682f341de12d03d02ef6db8dd910dbee45d4b100bcac0683
font_03_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 10152 bytes
SHA-256: bd8ceb9ea31b68065b00b52a78988ec0e668e8962eb60cf7411daad177944329