Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd8fb0f606c4c7e…

MALICIOUS

PDF

78.9 KB Created: 2021-10-10 18:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e66afb4ddf63e83573392310cc6cff0d SHA-1: 1a0ccefbc5387db42f95eca3bf946fc27d99061c SHA-256: 3fd8fb0f606c4c7efefd64c2ce28ed925c9ac00dd469c166a1d9bb16f49c467e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious content or phishing sites. The PDF structure and the presence of external URIs suggest it's part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ipea.kr/userData/board/file/69740985375.pdf In PDF document text
    • http://originalavto.ru/userfiles/file/fizozulozabagufuxodonom.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/pudejawawepanub.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/wodowalijokovosagiw.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/46510145588.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/kerefofiderefof.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/gojibuvabu.pdfIn PDF document text
    • http://scpt.it/userfiles/files/80681998759.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/dijuwaxikemarawokuru.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/37474046181.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mosakatojetafadawofivide.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/gizoki.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210911_220452.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/17070584881.pdfIn PDF document text
    • http://kd-council.com/upfile/files/48941862201.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/xibexoxamowogog.pdfIn PDF document text
    • http://leguido.net/files/nobanawasadebuxolarufe.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/32514217218.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/17125153927.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/mirenis.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/pemerekamumi.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/48403713772.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/puvedipulekiwulevinisuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=letter+of+inquiry+and+replyPDF 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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 19392 bytes
SHA-256: e4ba4bc5fa634cb411778ba66e0298352de5b97552b79f85d0d53f155f5ec816
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 10640 bytes
SHA-256: 9f64a5eb69725604e880ba6bd87c05b05622d05d37dc9dc2aab6270d71501d61
font_02_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1