Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07600f0b0f1a0bb…

MALICIOUS

PDF

71.1 KB Created: 2021-09-30 10:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17f74d3aa99f3f0577ec21976be2205a SHA-1: fefa3ae9fc039f4cc2341a4ba119a5fb7842a071 SHA-256: f07600f0b0f1a0bb6faf2425394c4279c6b83a6d2ee9b635272cffb760e57d19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs suggests the PDF is intended to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=live+wallpaper+galaxy+s9
    • http://vonschickenfremont.com/uploads/files/tifonijejikej.pdf
    • http://grupposcorcia.it/userfiles/files/94407074638.pdf
    • http://manegedebuitenwijck.nl/uploads/file/67397065096.pdf
    • http://viquadro.com/userfiles/files/daludarado.pdf
    • http://poddertradingandindustries.com/userfiles/file/nonuzububiku.pdf
    • https://banderlogclub.ru/Files/file/43210255681.pdf
    • https://svenjakretschmer.com/ckfinder/userfiles/files/sananisugixa.pdf
    • http://bedrucken24.de/userfiles/file/nijasejotixumuvujoret.pdf
    • https://9ja-bet.com/userfiles/file/98642857177.pdf
    • http://studiodabo.eu/userfiles/files/75176883535.pdf
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/lidevefukamu.pdf
    • https://stalbeckers.nl/userfiles/image/file/jizanisevixivodef.pdf
    • https://tekdalyapi.com/upload/ckfinder/files/12087519916.pdf
    • http://mikol-styl.cz/userfiles/file/luwepiraxobufesaso.pdf
    • http://31kouqiang.com/userfiles/file/1632723714.pdf
    • http://tsyrulnikov.ru/upload/file/52737524692.pdf
    • http://drsuthichai.com/userfiles/files/79739644604.pdf
    • https://enilubricant.hoakhanh.vn/uploads/image/files/fagosomaruvinuzu.pdf
    • http://fitsiluet.cz/data/file/gazigerevedafesipineguv.pdf
    • http://owop.challengersports.com/ckfinder/userfiles/files/16698786732.pdf
    • https://wspaperbag.com/userfiles/file/54420307048.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6ea447fc2---57171682869.pdf
    • https://birudongker.com/contents/files/zofefe.pdf
    • https://eletroluz-al.com/_IMG/img_internas/file/kusemawusutipasozimif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0ff.bin
b6a99cf8b3647d5485dc8f8e5c3b895e7050035dcb8ab14bfd5995a28fac0d0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FF 17652 bytes
font_01_sfnt_off0000de94.bin
c8041210232012a30cfa5f87c001a0d91f8e2f30d91876a6bc929451caf014d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 10600 bytes
font_02_sfnt_off0000f6fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 16792 bytes

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