Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b1d653b6791c46…

MALICIOUS

PDF

90.4 KB Created: 2021-09-16 10:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6ab02a5c05ac7dfa9cb7fc11a74c66d SHA-1: 52a00537fd0594e0c458c4dc66bf6d34a0db554e SHA-256: b7b1d653b6791c46fce6f38f20b583e0943decbea734f27e0b0b427893824b9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=logo+quiz+by+bubble+answers+level+4 PDF link annotation
    • https://cfaegaianascente.pt/portal/userfiles/files/ragemixafugu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133df43d489b---xozomatafolemidimi.pdfIn PDF document text
    • http://3sdent.com/upload/files/5566798845.pdfIn PDF document text
    • https://cristalensi.com/public/File/xamogibad.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/divilofulepini.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/70930936586.pdfIn PDF document text
    • https://pcetravel.com/files/file/56088113034.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///56878334044.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/diwikutofisobuzorix.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/lurozumuveg.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/29832884304.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/mozajatulakopitu.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/83337115312.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/27180976659.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/92889336125.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/logakodakusopusete.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109070211047341.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/bikav.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/kisanabujiziguboj.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/puwilimegeredozowitaralir.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/dowokekavamosisu.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_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 19028 bytes
SHA-256: dd35530770d32586767657f9cc24f966fb1a832d4467f607c12dc42182fcf6cf
font_01_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 10932 bytes
SHA-256: b1015c48fc50580434d98996898620b7e40641aafcd0180dc3d90184c2a6561c
font_02_sfnt_off000143ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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