Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b9e5734d64b8e4…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 21:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 625d792c55d3af64dff76185d348d284 SHA-1: 3b8de376e295e0e1eaaa178c85d3be31b6b23714 SHA-256: 08b9e5734d64b8e4624907497e5b87d428f949bf54585c5f2ad85f972b40e513
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=solve+linear+inequalities PDF link annotation
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/terusebavivakugupukagoxut.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejax.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xujegezavobigububaro.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/61831724564.pdfIn PDF document text
    • http://badgerhillfarm.uk/39529820252.pdfIn PDF document text
    • https://henuopack.com/d/files/jawunifuxixiwojinoki.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/latazodokodag.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109200001343652.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/nepezeduvosewama.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/sezurepizazisive.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/88087087808.pdfIn PDF document text
    • https://noventa.cz/media/files/file/49570420264.pdfIn PDF document text
    • https://gmt.twwebmarket.com/ckfinder/userfiles/files/ninedifivu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/gubomulelewufusodiripa.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/gotulobubolemedopuw.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/22754955185.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/zonikozokutikiwulowaso.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/87962715288.pdfIn PDF document text
    • http://clickvay.com/upload/files/lerigixurik.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/kukeposolakofumuwavol.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109140605249365.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/26483102335.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/90889109288.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/zefagutes.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/13414385309.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_off0000b191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB191 10488 bytes
SHA-256: 7aae55c2a9e5d4574b96f8ae30b274d19bdddf2982ce22dc1f51f4ecdc4fcf96
font_01_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 16864 bytes
SHA-256: 2251a76b4e342d75e6106f31c0682ce31bd836c66ca6e9edf9d16b4b46a1932e
font_02_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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