Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadf2e5f2ca65625…

MALICIOUS

PDF

90.0 KB Created: 2021-10-07 21:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f745923c06e4253ce470e2ac46cf6b98 SHA-1: 6b53eba7a3e1aefb0f456c9469e01ab81fefb283 SHA-256: fadf2e5f2ca6562554ab7155be5edb3c0a12499904d76a618b951e00bac3ddf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL distribution are indicative of a malicious lure.

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://ketchas.ru/uplcv?utm_term=sql+injection+attack+meaning PDF link annotation
    • http://budaors.varosom.hu/userfiles/files/dipanufuxo.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/gawifisimebowarizeb.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/41141135360.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xebetifolo.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/gajafewifa.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/nugoxogoj.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/dovotujipopi.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81983647673.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/20456402666.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/56072253118.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/46680295708.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/10371614791.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/28574238048.pdfIn PDF document text
    • http://suyogmaratha.com/editorimages/file/1049240126.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161562616c1a05---60118708800.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/92017989969.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/47254984884.pdfIn PDF document text
    • https://swiz.eu/files/editor/98778538621.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/jimolik.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/63087152025.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/4112400560.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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 20448 bytes
SHA-256: d41b92b7646ac3070f51f88605a40d27325a39111285ada0c8092e2d2951ccaa
font_01_sfnt_off00012a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14218 10748 bytes
SHA-256: ddc5dae50f15571dbcd51fe193af10a76f4af6f7306193f704c5ab6a6a82877d

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