Malicious PDF — malware analysis report

Static analysis result for SHA-256 c009af8e983c2814…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 17:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7dd51b21954c3051729c3c8329a99f9b SHA-1: ab60385770bfbefa2745573df455987aa42d6ba0 SHA-256: c009af8e983c2814ff3a6ad753f2a65abb67fdd8a08075d56277ad97f6d4ee63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=apk+super+manga PDF link annotation
    • https://pioneerlift.com/upfiles/editor/files/95860921055.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a32a57f25---jemutazukivaxapogag.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/fiwum.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/964835135.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/binorurezawegedovo.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/vitufipexivazab.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/tulojopefitabunus.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/favomajujudevakez.pdfIn PDF document text
    • http://mayjack.com/upload/files/46481237533.pdfIn PDF document text
    • http://888chji.com/userfiles/files/nulikezatufudusolubifu.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/45412370979.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/dujinuganekiwigis.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/rulebusumezoraxidogu.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/69136803109.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/pavodubagazidiro.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/tenizaleso.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/58435296102.pdfIn PDF document text
    • http://whatdwellswithin.com/file/tezapamutisazedegafamunog.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/dopubimu.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/jikojijuzizapagakanalu.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/25344550318.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/dogijilijopexep.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/72881676618.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/41330667940.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_off0000af1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1B 10412 bytes
SHA-256: 2832c807bba3debd2de2e4fbcd3975952b3d9d854e069bc41085c97c7ada9a3d
font_01_sfnt_off0000c6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 16160 bytes
SHA-256: 7e02989799ae1945006bf7f8fc3fa4ce6af9453863bf5d3bcef83f4d49090c60
font_02_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1