Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fee5e3e02fc78d9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 13:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94365f94c0a1ab78d4f2d21519c9be89 SHA-1: ad098ce817df5c30ede5c8e7a5f7c86e7c33ccd9 SHA-256: 3fee5e3e02fc78d91ba7645562e7b684d49cd19f15fa364a0b15427a76023183
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable domains and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://eprdel.cz/userfiles/file/kafumolejoxugesa.pdf In PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-19/20210919155942107097.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/vemek.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/24680876788.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/11900429088.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/48587922206.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/pizugizovenadu.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/wutidajikot.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/15535510076.pdfIn PDF document text
    • http://landpas.pl/upload/file/58590310322.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/12121185331.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/vipub.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/2556003089.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/xakuguwokirexolebadije.pdfIn PDF document text
    • http://freewest.at/sirajexonejunirej.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/fovoputum.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/fulur.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/65003760465.pdfIn PDF document text
    • http://15881588.com/ckupload/files/59914073407.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/63456352689.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613728b364001---80723345065.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/64091278354.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/47060450533.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/91246629204.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/82070968083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=zack+snyder+full+movie+downloadPDF 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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 17492 bytes
SHA-256: 1bf12b8d5249d7d9523a82439bb6ef2ce9a698846bbacc5a25defb6a1242c70f
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 10960 bytes
SHA-256: bfd80e5ed4e486f49ff29bca5b06bc783ad79dc15c0de2c4c62fc42efa56923f

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