Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ea2b554a386df3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-14 01:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 187088dbf6191be9e4dd417d8f379ef4 SHA-1: 5561ae8296dc1180fc4c5d30405a71af625c7da6 SHA-256: a5ea2b554a386df3b6f8f272014cfa188411daed7a77db77b68640ea212ec5f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of external URIs and the ML classification strongly suggest this document is part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=schedule+a+call+android PDF link annotation
    • https://romalasergroup.com/userfiles/files/nunegoputebonedofuwide.pdfIn PDF document text
    • http://rhondachem.com/d/files/depufisasatexupubuw.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/87314861700.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/49667186030.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16304612013305.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/80398287781.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/20664109884.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/wesunugivufe.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/tevunajatonomumeje.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/pumiwegudesup.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/wutebakeretukoze.pdfIn PDF document text
    • https://clove7.com/userfiles/file/wimoziwog.pdfIn PDF document text
    • https://bursac.net/userfiles/file/85291143174.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/zupibibinowowek.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/fozitiwemugonepijipuzuja.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/97535833637.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/kurizifetanu.pdfIn PDF document text
    • https://fuoriscena.eu/file/11722330381.pdfIn PDF document text
    • http://sireny.net/share/files/80973009668.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/99501381136.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091007431814.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/41486602591.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/22822899366.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/wikebasakamujaxumojo.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_off0000bab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB6 16456 bytes
SHA-256: 33c55ebed807e1ff1f8b0a23da08a2afea9382f082103ea8853dd7d62d479f70
font_01_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 10376 bytes
SHA-256: 72979df0dcc0eae8916389990cfef349fbd1bb48fa163059cbdb5b21010afe1c

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