Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d6c425a1f53447…

MALICIOUS

PDF

107.9 KB Created: 2021-09-16 10:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e17eb2ef0d335e2588302fd1e54ed98d SHA-1: 103825003cacf1c36270764032f0c058356145e2 SHA-256: 11d6c425a1f53447aed798506aa912194c209e966312270a530f3398b51fe033
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The authoring application 'wkhtmltopdf' is unusual for a malicious PDF, but the overall structure and heuristic firings strongly point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://shinies.ru/img/lib/file/lepep.pdf In PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210910_0A86D9B6E5B04349.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/pigepezititekitelafol.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/taxaf.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/59163620691.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/fomezinuzux.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/34867231842.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/68118150550.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e9e691dee13c5c1c475869aab1b3988a/kapowizupimipabazisox.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/jibebiperonikage.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090711573470554.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/mipazukapuzipunamofijux.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/72029213450.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/82413954993.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/xuloxoruli.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/47677754757.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/28021415691.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/22696298150.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/sorakupalukolikevesamutop.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/9072509073.pdfIn PDF document text
    • http://wwstationery.com/files/file/megokebikoralefesetimaf.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/45141887605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=remove+screen+timeout+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_off00013dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD2 10696 bytes
SHA-256: 766628ce22b6a38cd4e53251dc70b4c491e1f1c43286d2cbabf398fbfc40a5a2
font_01_sfnt_off0001566e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E80 19560 bytes
SHA-256: 141d2eec4fe8dd5e7b2e2a05bd906cf0e0d7e1d7673fd0ec16cb4122fb5764c5

Open this report in the interactive analyzer, or submit your own file for analysis.