Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e55b52b9c007ec…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 00:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f271cadf3b09a78d342397fda1db0431 SHA-1: a66843e0d648cd0fafc4e66dd03aa86dfc1c0495 SHA-256: 07e55b52b9c007ec58aebc541e073164bace120c8edd0a399056df7c46cd9087
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, suggesting a tactic to obscure the true destination and evade detection. While no scripts were explicitly extracted, the nature of the link farm and the ML detection strongly suggest the PDF is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://euro-ex.net/images/blog/file/kikorawowexir.pdf In PDF document text
    • http://xlpe.net/Images_upload/files/mogupawakowapuku.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/12970235866136859ea57c3.pdfIn PDF document text
    • https://codecs.ro/images/file/18248370871.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/vexajofobofesiwazilajeli.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/pamifigonojebaporinuwizu.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/48071917850.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161370a0c9fd89---10796187885.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/21114613317.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/44542838890.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/luzapagopeb.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/bunewupanajurenen.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/48949943558.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/70259022682.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/85348093558.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/jovuvadetikolek.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/boximiwefejivezozakaxibon.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/dumipidifunurivasovuk.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/74928746689.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/rapujumijosumoxe.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc13896de---85470930192.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/nisojetegupewugabix.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/makawajofunisebeti.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/pazikezizogederetunava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+get+apps+on+your+phonePDF 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_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 18020 bytes
SHA-256: cfe0e1237781b0b451272431e4e521508d589c8f8b8c59e2db5e5a2029974ce0
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 10824 bytes
SHA-256: 029ba57b3a308ead2339a13f85b468c1a6122d87050660d0946a7148cb847c10
font_02_sfnt_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1