Malicious PDF — malware analysis report

Static analysis result for SHA-256 11038c825226f9a4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 02:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7bfe574bfb35a1350fa9bc8274cc3f32 SHA-1: 09da6ac763ce4cabfdda0d2f8a42df992096809b SHA-256: 11038c825226f9a4bc5b7bd1fade497c22f7f812136ecbb3106c2e6de066368e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lure users to external malicious sites.

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 http://kantipursecurity.com/userfiles/file/34799351447.pdf In PDF document text
    • http://caerulumpharma.com/upload/files/5902226513.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/salijebimurabulaf.pdfIn PDF document text
    • http://i-physiology.ru/upload/20502485945.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/dufezukanoranubigekag.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/88194225790.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/1657088133.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/11208661722.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/zikuxu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/75381272007.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/xodakilanikonofupelab.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/16849694716.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/libojugikuletowen.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/zepupiwowam.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/6591163076.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/35870695523.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ea74f653aec8ab9b116fd5a32e7497d9/xavibukalorive.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/jirizulitegev.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///xolekigaguvudamunosimeju.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/97033611943.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/wixeposafuwozepadodop.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/95334378513.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/parujuvesowitaripo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+send+apps+to+sd+cardPDF 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_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 10448 bytes
SHA-256: 819bcfeb9a0bc5cf2f85c4718aaad7c9a5e92523869a167957d75b3dd2ef25ed
font_02_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 18584 bytes
SHA-256: ed19acfe0eb13a08d8e35f1a64bfd6ec3a637f0112b639fe4f5d084e21840cda