Malicious PDF — malware analysis report

Static analysis result for SHA-256 b637c0651f72da4c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-19 05:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f36a556625e3e002867f4e3fcf05da0b SHA-1: b07a5c09ae76bc7de55b2604899d93fc9d534387 SHA-256: b637c0651f72da4c201eaa00669e892c1d86ac8a596a35c4cba44004c1600849
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of numerous documents, many hosted on potentially disposable domains, suggesting a lure to download further content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zoncmswebsitebeheer.nl/files/editor/file/45262062253.pdf In PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/mafagumawebosuvufesanogas.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/64999680312.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/93418570639.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/75457304480.pdfIn PDF document text
    • https://patc.fr/imagesfile/difobafuruvatijerevibu.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/dagonujedokuraraxeso.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed2301ed17---65339711435.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/91879936500.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/50431821342.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/53805613389.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/fodugolinavubigoxizamuju.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/nikobemabirodunasewi.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/65346252614.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/gefafafeledijejavitujef.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/52797754183.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/rugonofago.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae77492403---33029115417.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/vegarowuxo.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/modesotubozisesugitipenuk.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614383f19f0c8---3319774454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+set+ringtone+from+resso+appPDF 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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 15056 bytes
SHA-256: 14c9bdd31f914a09d6d9b54bdb3cdd023b89093c341040430bd87b17e6aecdf0
font_01_sfnt_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 10732 bytes
SHA-256: d4a6ec3f2e583166451e5cc7a38cc95c44234845bcfe8994fee12d8019de4d9f
font_02_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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