Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a8985da9eba7d7…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 14:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 146f862e37966da600d648838ec66d74 SHA-1: 0f28e912b13005693bbc2f5748a05753815f4d1d SHA-256: b3a8985da9eba7d7b36a9cb98f4be29534320269b14bff7dba43b67c4312c011
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://casasholidays.com/scgtest/team-explore/uploads/files/xakuzabumiritotaxasud.pdf In PDF document text
    • http://mikailang.com/userfiles/file/20210901165251_1858732235.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/59106775430.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/podotaxejodidipegakabipag.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6060048971.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/vufogalugijuk.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f887ad1cd2---64410513375.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/99207608330.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/liropudamufajuja.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5354b088f---ralogazizazaxisuwibixeji.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/pelutegonegejinit.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/kuzaxuzokubopamena.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/57488918144.pdfIn PDF document text
    • http://email-database.info/userfiles/file/10956992121.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/wuvalexulutivitedodove.pdfIn PDF document text
    • https://bawauang.com/contents/files/vumotazanolikuzimobuzu.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109172050154024.pdfIn PDF document text
    • http://slsnn.ru/content/file/83104814013.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/87230508389.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/sevudibudofulijoxe.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/zonida.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/91795740251.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/57724698812.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/favidipolizodij.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/11253326416.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/busekiretupudejefedavuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=house+hunters+streamingPDF 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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 15992 bytes
SHA-256: bbdca7f424481ce5a29cf05ac3dea0a889711ed44a7d5e865ae7772de8b777b2
font_01_sfnt_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 10600 bytes
SHA-256: e5d67271fbdd0e379d975b79bd0349b0018c68b6440371aace00008dfd5af415
font_02_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1