Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e3dc12043a16ad…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 23:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c00703eaf48fc1ea2a33117505c79a27 SHA-1: 20e6eac8689fb79a8dfeca40fc19ebfb9f98defc SHA-256: 80e3dc12043a16adcd3ffa80d5c1d0958f2bf7b43b2d73ed2c2c49d0fcc459dc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, which is characteristic of a link farm designed to distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ave-france.com/pics/files/tilesalafenuwesobaxujaw.pdf In PDF document text
    • https://luckysurface.itweald.com/uploads/files/61307498ecb6d.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/43969335313.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/4862474071.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/pozepajerurimamusose.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/pufesalavomujapiwikivoman.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/wizev.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/48793385671.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/90101693551.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/futudot.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a69f4837ce---23771058678.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/kiwebiz.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/bopijidofixodigaz.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/60786525613.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/bafowagozekadotojoxu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399946c8406---magejalerilexobovowik.pdfIn PDF document text
    • http://cl-pub.com/files/files/pukexavamedodujorim.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/moguzuzoxasas.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908123604.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/difojupifevaxunen.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/pariso.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/bigogolujebudur.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/daruzokefekelojofomosere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=showbox+channel+livePDF 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_off0000d13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 18808 bytes
SHA-256: 74650b2b3715e7db05667c7e340dda6cf5709fb62f31c95de11668ea8a97f7c3
font_02_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 10428 bytes
SHA-256: 830254888bc21fc17f82e5250f2918dbbf903e27bfb57476c462b08cf03ee208

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