Malicious PDF — malware analysis report

Static analysis result for SHA-256 772244b9af1dc287…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 11:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 692ca86258755549a073bab3cabc01a9 SHA-1: a78e6838ba5463151e4c6754d22f92cc006bf79c SHA-256: 772244b9af1dc287980824f6100fee44377632b38e958dd100a1ba9414f18a79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It utilizes a link farm on disposable hosting, with multiple PDFs hosted on distinct domains, likely to distribute further malware. The presence of numerous unknown URLs suggests a broad phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://suphammamnon.org/uploads/files/87526983377.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/takawajavimonagozexakawev.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/50349614339.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/70516473978.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a3f4d9f47e402f3d3f5a752115fc83a8/sesudawu.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/47356097918.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/6534305531.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/bezizimewisuge.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/59839643899.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/18032655598.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/gozadezugazozewob.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630787534.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/joxofabem.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/65852923946.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/51208005259.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/faloji.pdfIn PDF document text
    • https://ccar.host168.com/data/fckeditor/files/befulupuv.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161391963431aa---10903894941.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/49636717467.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/sowetad.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/kisopatazivawatin.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/kowozoluvafotijesidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=offline+fire+game+downloadPDF 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_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 17908 bytes
SHA-256: 03aa90104e35c2e573a2ff190ce4af01aae5c11c86cd64fde9f141061b278806
font_01_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 10540 bytes
SHA-256: 215065d4c08836a445917132144172ce4cde56dda988e8fd93e85a73ac697dc6
font_02_sfnt_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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