Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0263310d0ac6b4e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 07:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 259ce271fdf3579083e49a40f737af82 SHA-1: 4d4268331fc761abcf9a2d80f23ecf2020f5e829 SHA-256: c0263310d0ac6b4e8c7a77a9b353ff8b634bfed1ef03d2fec776ade7cbe4e999
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://csmgh.net/pevron/www/img/file/52171370934.pdf In PDF document text
    • http://vertex-decor.com/userfiles/file/bituxasafenebiremojusel.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/psquamnsoi6vfpjjdun8eq3m2i/42905540695.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/fusedizixefa.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/87355688564.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/vopebowewukilalibiravafi.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/nakujusudusamet.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/85535549182.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/ratemi.pdfIn PDF document text
    • http://lagrupacio.cat/file/13697092339.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/73f708159dd604eddf50c4430a27551e/61710785196.pdfIn PDF document text
    • http://splogservice.ru/content/files/tiwuxos.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/33692819540.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/73276591451.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/jatimajigerovega.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/95941279922.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/69591972360.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/nowusin.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/vajonudosorolape.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/wibexipew.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/3135536319.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/63114586627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+mockingjay+pdfPDF 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_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 10956 bytes
SHA-256: 3e92c5b5a998437c61208a470c3b9f7e12cac250152090e1398a5f92067659a9
font_01_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 17792 bytes
SHA-256: b67030965f331a50e7e8cdf1e330be78752062b5b1d5d29fe82a95c65dc6d970
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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