Malicious PDF — malware analysis report

Static analysis result for SHA-256 4592540db6c8a7c0…

MALICIOUS

PDF

87.6 KB Created: 2021-09-15 09:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da26eda2162c9ff56867bd4cd987bae5 SHA-1: c2457a4da35eef076b308804286d2929495b28bc SHA-256: 4592540db6c8a7c0bcc14c11320728d438227cb505514b2f81f8e4412e1f030b
126 Risk Score

Malware Insights

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

The file was detected 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 part of a link farm, suggesting a phishing or malware distribution scheme. The 'utm_term' parameter in one of the URLs indicates a lure related to game hacks, likely to entice users to click through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://explosivedevices.ru/media/file/wakolu.pdf In PDF document text
    • http://colantuono.it/userfiles/files/88188081636.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/91065283940.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/korapewomimebesiwozogo.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/63542732039.pdfIn PDF document text
    • http://chayka-svg.ru/files/94854527934.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe69b966bc---20695125335.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/sawitinajeniri.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/66457812057.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/sutofotadebizuzurejujob.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/limabegozorefuzepipaxetu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zimigugetobolor.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/zotevofapepelosisimi.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/10253408969.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/tifipojugifus.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/mebisirosit.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/61253992725.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/damezuguwefarijunam.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f48453b9ff---mawegefejaw.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/33132818579.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/tepamatizavebebezuguga.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/857364235.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/50944012449.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wuzisobo.pdfIn PDF document text
    • http://bndweb.nl/upload/files/49088071258.pdfIn PDF document text
    • https://maria-galland.ru/files/file/59030410678.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/jopuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=shadow+fight+3+hack+unlimited+money+and+gems+onlinePDF 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_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 11464 bytes
SHA-256: f2e80488e7da3dc60149297a2062047fb8fc38a13cb41402dbdf2157ad557149
font_01_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 18252 bytes
SHA-256: f9985d24564a7be613918b93689cb70606cd26cd3c91b09574768a1b378c8163
font_02_sfnt_off000137e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1