Malicious PDF — malware analysis report

Static analysis result for SHA-256 3914673a60cba678…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 04:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32842c77c6c5b7da91409da0c8805a32 SHA-1: 875da8865a7ce959213238eaf01b414cf9b55b76 SHA-256: 3914673a60cba67863729b6b6b609c227507272720621f75d8f6cf7a05565846
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for distributing malicious content or conducting phishing. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=how+to+open+my+phone+if+i+forgot+my+pattern PDF link annotation
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/14608588839.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dofuwojupudimas.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/jizibizewida.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gezavop.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/rojudizanikok.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/87286031271.pdfIn PDF document text
    • https://interconformity.ro/images/file/71428511489.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0072c05f6---lejupanexesuxotopinu.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/6428621494.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/tasusuxijo.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/fepolenifosusig.pdfIn PDF document text
    • https://phukienbep.net/media/files/dukotigopom.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/dutasufubala.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/vefazemogasonozu.pdfIn PDF document text
    • http://gabortech.com/admin/file/48902591470.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/6865278941.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/turizabikaxonabotavex.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/pigixalobupev.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/73167902897.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/ditevebesoketa.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/bodenalebilewobife.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/97588806814.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94b489a2e---45747488384.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/bekoreredusogoza.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/35842482634.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/barezobagewusomuvunuwovaj.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_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 10780 bytes
SHA-256: e5195f333674e4f662672c9047414edfb6f2e1f2035d5f030df70c1894f737cf
font_02_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 20176 bytes
SHA-256: fd14bbac06e08860719959d5e726287393df517fd04851e31d84bf5a41610e48