Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc25c9474ef75e3f…

MALICIOUS

PDF

93.2 KB Created: 2021-09-09 02:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e284e35693bdf4ba2abce4b1c1217764 SHA-1: 378b10add6b451fbc44892677bfe43b5f70d5e92 SHA-256: cc25c9474ef75e3f08c1e03ceb9979e13cbb81f27bbb97fd8531ff5d415bcafe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://oniceh.ru/uplcv?utm_term=how+do+i+set+up+voicemail+on+android+phone PDF link annotation
    • http://al-bandak.com/userfiles/file/sowufimejezaboma.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/jejuwadopu.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/16614497795.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/gudiduxifonosikevevem.pdfIn PDF document text
    • http://grandfiltr.com/files/file/93959317201.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/21426574424.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/vexikelor.pdfIn PDF document text
    • http://muszempilla.com/files/file/29745935349.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/38376769820.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202198205355420.pdfIn PDF document text
    • http://amdind.com/userfiles/file/modekizebogufizak.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/tusinutajupapiwuwowenemiw.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/26434991058.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/noximafijiz.pdfIn PDF document text
    • http://agilesolutions.in/uploads/supopol.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161367557bccc7---migepeminoweresurolakefe.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/sanedazowama.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/44463501502.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/34115700709.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/gogadetivapiwuxe.pdfIn PDF document text
    • http://snft.ro/media/file/finonekinifafegota.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/liwurexavofew.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/muwemidejebofa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014966.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14966 18100 bytes
SHA-256: 0897b9b2302a77edcaccf6b8de6b2a54a9742f25ee6ca617541e80b4785818ca
font_00_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 11024 bytes
SHA-256: e1b9ee225c5e96957dbdee5b15a353ebfafdd28e3bf3d9117a8cb726869d3638
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 17620 bytes
SHA-256: 7c8b1efe04a736c8845b73a9e7483d39f00a0afb0673456b8a89fb1b7e2f7891
font_02_sfnt_off00013155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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