Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b808aca5f5866d6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 22:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28ad7fbb18657edf9217713dfb9bd010 SHA-1: f2b8814fad68f13a3b8962274a89f800fd8a62f8 SHA-256: 0b808aca5f5866d65d118b155ef4aa47d331a25b9576820b09241f3ff86c3f7e
126 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, with a specific ClamAV detection name indicating it is a phishing trojan. The PDF contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely to redirect users to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.studioline.ie/ckfinder/userfiles/files/jasadexifafeweje.pdf In PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/949805705.pdfIn PDF document text
    • https://magatek.com/documents/file/83698009078.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/zemuginomibuj.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/78672069437.pdfIn PDF document text
    • http://neteyes.eu/editor_up/wevavepigexigekizogup.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/42171724758.pdfIn PDF document text
    • http://faradbox.pl/files/file/60291723817.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/64341027767.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/lonekez.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/dalogenowukipog.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/ralirinivazo.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/82247274670.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe7207757c---demelonalupoga.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/norusupaku.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb803439bf---gixobazunaravanalutab.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/58764725456.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/zubekulitedemejeledurereb.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/72262941113.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/73102205136.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/17330915561.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109121255213773.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/jemodonawegalesefamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+save+multiple+pdfs+as+one+filePDF 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_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 10804 bytes
SHA-256: de7b653055630875588d6ddf90e2c8688441696b8f655b596169dfb537e8323b
font_01_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 17776 bytes
SHA-256: b53603e911e7083705b39ac68778f5f340719fcd7f57d9a20c2077a89f9e5b5b