Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ea9861447c5139…

MALICIOUS

PDF

94.3 KB Created: 2021-09-09 19:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c497ec15f7a8e6a4f7d2233651bb1af SHA-1: ffd0d5abfc8aee8c0b854d0f96ff23dffa83d671 SHA-256: d8ea9861447c51392a57b97642f03001054c810797922befee80945db563974c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a high number of embedded links pointing to various domains, suggesting a link farm or redirection mechanism to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://consultemergingmarkets.cubsindia.com/files/pexatexabiludulefoli.pdf In PDF document text
    • https://samajsutra.com/userfiles/files/rugijup.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/konilazikozitenategozut.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/fumugizukiwu.pdfIn PDF document text
    • http://lex.tj/img/file/lusakazag.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/lunalajixesanutakibizev.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210908221540.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/vijetamu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131d99542afa---ridadugasusimos.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/57475127641.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/jufufa.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/69104240948.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/51063893019.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/tadexuvawutuxowidosobu.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/27119743588.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/perake.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/gadarasukimiganevejamili.pdfIn PDF document text
    • https://ckmandarin.com/uploads/samurarire.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/80877129130.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/19051625734.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/wokevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watch+amadeus+movie+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 16424 bytes
SHA-256: ef8701eb79685041ba51b48b3ed5be6a2743d899f5b89193a8f0275675b44e26
font_01_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 17804 bytes
SHA-256: aef80962c09437411e3f5629e45f28ba884e47c3fb896abf19628be12697b4c9
font_02_sfnt_off00013a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001524e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524E 10692 bytes
SHA-256: 1aff4499e98dbef14b0a9e535bdcb7b62b29bbc44f25b706b4be52576444385c

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