Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76f00cc4e6e4dec…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 17:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2241851eab17312b61ec1788847617ae SHA-1: c4a65d7a753a2b9b2bea7c48115937d1973f9d33 SHA-256: b76f00cc4e6e4dece852e200f3507b93ecc089d5a2f3691b9bd35923435f627a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The numerous embedded URLs point to various PDF files hosted on potentially disposable domains, suggesting a distribution or phishing campaign. The primary goal appears to be directing users to external content, likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://carzip.biz/files/uploads/files/sorotapiburipebekovevab.pdf In PDF document text
    • http://amongelite.com/ci/userfiles/files/65927151240.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/tegigukokov.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210901_193848.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/68823454323.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/mokis.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/butofawirisura.pdfIn PDF document text
    • http://honghuibio.com/d/files/31612361222.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/67099328853.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/xegigeriduwu.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/jisopifogatonekisoduxux.pdfIn PDF document text
    • http://canadianrockies.info/files/file/73083075160.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/11811142814.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/10259504146.pdfIn PDF document text
    • http://apismorava.eu/docs/jijoxir.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/sekobanososivagam.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/jisitukedilaselab.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/16936741890.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0b11cac0---48033291525.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/37858962536.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/zizox.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/kedofiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+run+code+in+android+studioPDF 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_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 10492 bytes
SHA-256: 5813f462b8ca4a79bc1718ed18aa8751b8f368fb8c313732a64812c034706571
font_01_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 17768 bytes
SHA-256: 56954b45df4ced3b0f8ce75f0c3ddfc7d3ebe2759f9a2283a102937ebee0b501

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