Malicious PDF — malware analysis report

Static analysis result for SHA-256 7715ceab043921b8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 00:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d506421784f8fb53b523afe9180f628e SHA-1: 6e7157ef631574d176fca46043da1a9566c487b8 SHA-256: 7715ceab043921b8d1d3e3152150152eb5befb50ff98454bf0e13c2e888123ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://oniceh.ru/uplcv?utm_term=what+is+the+ssid+number+on+my+phone PDF link annotation
    • https://amigo-shop.105h.net/upload/files/rumamajamunasalexi.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/pofuxitemaka.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/26758355898.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/83986134985.pdfIn PDF document text
    • http://e-district.org/userfiles/file/53288012451.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xolunizavedegisolexuru.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/bazudexabonizogigi.pdfIn PDF document text
    • http://kccmaul.com/files/files/bezofetijabowi.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/34463569189.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/t93n1dnpn6r7o98hefl4f30ump/nejaxasagevo.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/bepijogevumojobavaropek.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/74895091686.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/bowet.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/vujobozujofuxu.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/10/vadux.pdfIn PDF document text
    • http://myphamasia.net/upload/files/97311689649.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///35467221790.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/mobibetonokakuladit.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/15758628148.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/62688966746.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/buzijal.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_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 10960 bytes
SHA-256: d947b793b3b14859ac2a41f44a6cb3f15ee07841af8efdcf669a57a5b4ae3ca9
font_01_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 17464 bytes
SHA-256: 3902af7b03088f850f3b91c9993eb5430e4b0ee1dffa2d97f2641f984b5a9308
font_02_sfnt_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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