Malicious PDF — malware analysis report

Static analysis result for SHA-256 70aa22dba95c3624…

MALICIOUS

PDF

71.4 KB Created: 2021-10-02 23:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 686c95f023fafd44deb09b8013d72e62 SHA-1: f50e764a29312a81849786a0c6a6610f429d7960 SHA-256: 70aa22dba95c3624c460be501aba1572d064c08497cc2efd9bd644da3451d408
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The PDF contains a high number of links pointing to numerous distinct, disposable domains, indicating a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pataniforum.com/admin/jquery/ckfinder/userfiles/files/rojoxepa.pdf In PDF document text
    • http://petgears.com/app/webroot/files/file/25937086031.pdfIn PDF document text
    • http://precisao.net/files/files/kuwejuriteb.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/rujoxojolebulepo.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/vimepitasituvipejiwavig.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/27350992736.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/84568979172.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/5459165162.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161589bd2aa3e2---xitofezexob.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/joluvami.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/62521288757.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/nanuxotefisorovepipokik.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138a8b80ef11---42821693586.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/19943099599.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/wovokidunozejosumesipe.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/feritavovegixupamibesasur.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/rumugosozoxilitid.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/xanibuxif.pdfIn PDF document text
    • https://partetesal.ir/data/file/44932640603.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/10466421499.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/19334660276.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/fijexubepebatiri.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/jisinegotim.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/risejosama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=severe+cough+with+phlegmPDF 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_off0000b431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB431 16860 bytes
SHA-256: ba0dec345c3db628777f057c5a72590f4dec26f6d00b5373127e46f03783f945
font_01_sfnt_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 10712 bytes
SHA-256: 9141873b6dac0f748a66ded21d7cbd331b08be0d218ba7a48f63c9e05cc77d4e