Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dbe948efd92970…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 14:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b641e6a4dd1c4824db2c811a9f7055b SHA-1: 1043cbd92f5c767801b9e774a09bc38f003e6bc4 SHA-256: c8dbe948efd9297048bbe72a3daad9fd5e0e1d3ba09a6ca7aa2bcce609894960
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to potentially malicious domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pnp-studio.com/fckeditorfiles/file/wowife.pdf In PDF document text
    • http://ggmtc.net/userfiles/files/zifokazo.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/30100040815.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/wamid.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/sizepo.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/78729451690.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/85869716081.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/rarinokijesiteru.pdfIn PDF document text
    • http://csp.hu/editor_up/61937617770.pdfIn PDF document text
    • http://zuche0551.com/upload/file/33691186436.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/werosenatoxekazo.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/57775639542.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/suveropabipuwarokinere.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/moxotunijuwibotejitabu.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911205121.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/45842172790.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/54796533545.pdfIn PDF document text
    • http://dgkno.cn/upload/89237953897.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/duvewojupek.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/45029110201.pdfIn PDF document text
    • http://maintenancebazaar.com/userfiles/file/46855993291.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/vakeliz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+gps+signal+strength+appPDF 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_off0000abdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3ED 14928 bytes
SHA-256: ff0f453bde782ad3b8c84e3f383568fc6e17cf29a4b06d8b2e1aade935235b68
font_02_sfnt_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 10652 bytes
SHA-256: 293589a5545de7480cc963fe6b1198e70ed63459be5a12e7181842af8d913444

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