Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda8ee8734c96979…

MALICIOUS

PDF

74.9 KB Created: 2021-09-24 06:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 56535e71b63e3fd3ef2a9672a6ba8b3a SHA-1: 48604da7b6715142fe8db2e243b0c318b1609097 SHA-256: fda8ee8734c9697944bffee6558b6dbdbfb67bee6e46cb60be70e98028bbf791
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and ML classifiers. It contains numerous external links, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. One high-severity heuristic indicates a PDF link to an algorithmically-generated URL, further supporting a malicious intent to redirect users. The PDF structure and embedded links are consistent with attempts to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://mingyi-lock.com/data/file/userfiles/files/48547968509.pdf In PDF document text
    • http://newtarrytowndeli.com/uploads/files/32999900079.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/32678585267.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/moruligufanax.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/8717766246.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/genafasa.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/18399594928.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/nuwijitag.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/38647161543.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/72449809858.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/eiqc2bp8o6r2r1ou30d5nean0p/kojeragaretop.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/66682151476.pdfIn PDF document text
    • http://texmet.pl/userimages/file/14190128385.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/51561635606.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///repir.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/33775542234.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/37349581690.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/wuxevapuj.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/34899328046.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/55951161973.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/porufusesufoba.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/33608359823.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/70318336320.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/96175573699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+website+for+booksPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 10356 bytes
SHA-256: 612088097539703f4869a240c4d70ab1500e52bd3c16d9aa57b153f558303d10
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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