Malicious PDF — malware analysis report

Static analysis result for SHA-256 8804e542277978bd…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 03:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cf4c26040fd0710f788fa7ec7618bd15 SHA-1: f144805f8004a4d5565f66eff3155bd3bf8d1188 SHA-256: 8804e542277978bd649d46f5fac9595a9380d1fdeab61cce2c702fe5d582eb61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=how+to+love+a+text+message+on+android PDF link annotation
    • https://shevtsov-art.com/uploads/files/84312249965.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/35465328521.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210905194724.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/buledosagurovafozo.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/37098205645.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/nimin.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-01/images/files/71263164321.pdfIn PDF document text
    • https://digireg.se/upload/93705502418.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/zibukafoj.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210902020139.pdfIn PDF document text
    • https://andhimazhai.com/images/files/nutojubamiraru.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/rujer.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/mirafuwo.pdfIn PDF document text
    • http://superazs.ru/images/news/file/92584746832.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210906020849.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/30081384880.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/48725417345.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/ravajanital.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/labumogijebizafen.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/64408960979.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_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 18324 bytes
SHA-256: faf9c2a629ff631a64cc6a3455d3ed55cba50e32af277f7f0551d9dfb4e1372e
font_01_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 10836 bytes
SHA-256: 1d6e2d266371d438dfa5557b2c0cddd826181c9045d647e448278859ff80b38b
font_02_sfnt_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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