Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c541d2a973c6fe…

MALICIOUS

PDF

74.5 KB Created: 2021-09-23 00:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d8bba338f31515cefe1abbe15bf96e5 SHA-1: 0789583c05023abd4086ffab33d1b14d0b38f4f5 SHA-256: 80c541d2a973c6fee56edebd7fccf8171dec3dc511219c685d4df19f3dffa3ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=5+star+cricket+app PDF link annotation
    • http://systempro.kr/userData/board/file/17438265671.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210909100042.pdfIn PDF document text
    • https://conrays.ru/f/data/wuzunuxeviwajemaduw.pdfIn PDF document text
    • http://keyday.ru/files/files/siduvatadiragawowev.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148bab7bbf8b---23868587942.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/60389596273.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/32702611171.pdfIn PDF document text
    • http://isgsrl.it/images/file/78669895805.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/92150693322.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/37017762005.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/basoramudilu.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/baliwosakuvizufofitipupif.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/zusik.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/nunokegenovapetifo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/53822770359.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/sunuwivafakogogejag.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/84544156604.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/93618267227.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/98937753247.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/74364472631.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/teruzaduxojedobudutaguwul.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141609907a7f---zagozifozukatikujibapeni.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/23246033018.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/91472405430.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_off0000c1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E8 16692 bytes
SHA-256: b1bd852f7c79664dbadd8663e0c3234c5aabda478ea2a83123595dad71cc8f88
font_01_sfnt_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 10228 bytes
SHA-256: b0d051f3a6df2e571c2a993bba84689a574714465957776d861f329f0fabd171
font_02_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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