Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3637cfe0526e618…

MALICIOUS

PDF

72.8 KB Created: 2021-09-29 03:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6da6e8fc92e3946585780b381a0232ac SHA-1: e050c3011a1e7dae0bf1c3f8d0fa4d1bedb05320 SHA-256: b3637cfe0526e6186c4862c4c4d43b23c6f93aa2ddb9f8da106da8f72089e2ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sterenstein.ru/userfiles/file/lutaxejujivifunuzugigajo.pdf In PDF document text
    • http://ud2-140.com/files/33635074447.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/xerabiwe.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/52004322362.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/wesesazuzepafadonozo.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/73452281718.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16130d22d28848---66351542651.pdfIn PDF document text
    • http://hkwwta.org/userfiles/93488674344.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/xanawuxuluwefon.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/lawepibotivatenezoxetiv.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/jimisefoxeboler.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/58471093685.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/domaduwixivuzidebekituko.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/86479087396.pdfIn PDF document text
    • http://inistor.com/ufiles/files/luvomutipofimovakosevuna.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/wajamatekikoxowefegebexum.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/61004341767.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/dejinosolejimowo.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/12546301285.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5477c1f6---49543372148.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/vakedafamasofefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=reproducir+videos+360+en+androidPDF 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_off0000b3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B7 18748 bytes
SHA-256: 9836058b9432bb5b72ce80120cc594a6b50c2ded962cd0255e58d6a91c5561ed
font_01_sfnt_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 11036 bytes
SHA-256: c1740dfa2798acdc6dd825543d6d0d98f81f8b3a70a1dcbb839e1f83cd97bce0
font_02_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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