Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfeae0f95c4e060…

MALICIOUS

PDF

83.0 KB Created: 2021-09-24 01:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4f150d828a4fd88821fff15173b65ec7 SHA-1: 6f5c7c03416bc1562963ce5a4155f94fc7634729 SHA-256: 8bfeae0f95c4e060db40293fa556e5d356029a7e977b2c96263c7a1e4c92b4cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. This strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=firmware+mxq+pro+4k+xr819 PDF link annotation
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/diwodotulogijidimig.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/zerisagosapur.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/feserogigefumexobu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d94e9d9f9---xasuso.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/24877090328.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210921170127.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/38933286274.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/16632914397.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/kolikilibenujegogej.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/rozupoxiz.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/57189483512.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/wubixibizukibewiguluzof.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/14434821924.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/9453289933.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb0184fbf---kojuriz.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/gukumufexaranimegad.pdfIn PDF document text
    • http://skncn.com/u/files/44025574701.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/39229697011.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/piguraxas.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/bolaverumiridemok.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/suvosodelatigu.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/jobiwonogupik.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/24384018708.pdfIn PDF document text
    • http://agro-partner.com/Image/files/lidimopikepewurufekuri.pdfIn PDF document text
    • 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_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 19240 bytes
SHA-256: 559cddbae8610d0675ddb471008fc19d2e84ee0c0d8bc80c37cc397dad9f08f3
font_02_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 10908 bytes
SHA-256: f8fa76308c7199d20053a4c56b41a6177b819498f02d95ab1c24e2bc72570e8f