Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bba204f0d8328b4…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 19:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a28c1f3ca0eabf284334c225b0ef8cce SHA-1: 32ab5637a530d29d2c6c1ad74af5dd41c062287e SHA-256: 3bba204f0d8328b4e38794e49afb0d6916817990098633d90a9af7d434aadbfd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct domains suggest a coordinated effort to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://philabc.ru/uplcv?utm_term=stronghold+crusader+kings+3 PDF link annotation
    • http://floridare.ru/app/webroot/img/uploads/file/052309_wuwanaxemu.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/28466577638.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/zizuj.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/befobivik.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/83343093399.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/fupipufu.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/68345271850.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/81531467949.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a17798cd8---sefador.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/sulegabiner.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/1277142203.pdfIn PDF document text
    • http://karikatura-kovarik.cz/files/file/vakogef.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/rokigevovubamelula.pdfIn PDF document text
    • http://magischtheater.nl/userfiles/file/33103325417.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/zivulekenelenitob.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631089583.pdfIn PDF document text
    • https://sanidom.pl/img/file/xopudizalobujobokeb.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/fomuwaxisovevikiromijivus.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/funototawobuvosofamaj.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/vepigulepakejatupuxawixex.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/98918659496.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/xomulukavezalepifazur.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_off0000ad56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD56 11088 bytes
SHA-256: 133bdd143d8f26a31c161ffb7e75461cd5299d50563f6cfa2ffaaddd4877abf7
font_01_sfnt_off0000c6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E2 17036 bytes
SHA-256: a743bff3f09ae96da3da24e8a80430f61a3008541965b95f638a011db297db82
font_02_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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