Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e964a3b6d2021a…

MALICIOUS

PDF

87.1 KB Created: 2021-09-12 13:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d824b1d296f25d439fa66a3956414b2 SHA-1: ed3c20f4dd9549d90449f9b82451cc490c1678f8 SHA-256: 48e964a3b6d2021aa184499a007002c705a52cc54f528f50dd299bbb94dd16a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious domains, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a deliberate attempt to create a network of redirecting links. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://philabc.ru/uplcv?utm_term=gbc+emulator+android
    • http://lso-msm.com/userfiles/file/82611118856.pdf
    • http://donauwell.at/userfiles/file/zujiwisasoxug.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/kowegojeber.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/piwusot.pdf
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/varoxatizavavuxu.pdf
    • http://guoyangmoju.com/userfiles/files/zezopenetetupixodota.pdf
    • http://tatagz.com/uploadfile/files/42243309494.pdf
    • http://rakkhunnursinghome.com/user_img/files/vadudigupujavawifajaw.pdf
    • http://another-partner.morefriendship.com/upload/files/13532547687.pdf
    • http://vizugy.hu/uploads/files/zekutobosebewav.pdf
    • https://khoahoc.timviec365.com/picturesfiles/wekisi.pdf
    • http://chiaranannini.com/userfiles/files/78365813348.pdf
    • http://brkvinc.com/userfiles/file/18559588139.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/70357187388.pdf
    • https://foulardfotografando.it/file/83784019482.pdf
    • http://etkenkalip.com/files/27758208288.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/89148899571.pdf
    • http://paolacaone.eu/userfiles/files/pokerim.pdf
    • http://belean.pl/userfiles/file/dilewiw.pdf
    • https://yar-net.ru/userfiles/file/85692265727.pdf
    • http://alrehabourhome.com/userfiles/files/fojimobizodebomodeb.pdf
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/tejaduj.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/55123864924.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa89ad62df---42536611099.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/marir.pdf
    • https://creteservices.com/FCKeditor/userimages/file/34516175307.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e561.bin
43d65fedd4ad4669c48446df0239dc558c4c00e05dfb68dd3738bd24c7d7eac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 21588 bytes
font_01_sfnt_off00011e89.bin
51a8327a223055b1930acaf021365e7ef231f4c29bf38905a7988109d4820e57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 10644 bytes
font_02_sfnt_off000136d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 16792 bytes

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