Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99dc41f6a705e9e…

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 10:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a6647e8b2d052ce54188dbb6f45798b4 SHA-1: 69d50c14a9a7b48ebf61791f418a3ca92e08c20b SHA-256: c99dc41f6a705e9e40e33cb605c4056f1dbcb02144ec996e3d76c3c5229f077f
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135312c4192e---99632712436.pdf In PDF document text
    • http://biosite.ru/images/news/file/fetuzipamegovomoserez.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130823a47753---13162624.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/vutafurusasiremu.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/gajik.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/37881484373.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/43058394610.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/dotaseju.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/roduxalezukawufifok.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/jozinewozujumusomobafogif.pdfIn PDF document text
    • http://watch62.ru/files/files/88964521417.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///44990448013.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/76193531978.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/45537028564.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/42804071855.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/bamadurabogikudatemir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vimage+9+apk+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_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 10684 bytes
SHA-256: 4f3b3d3380267ff429a995d89657ab524411d966d5d859160f2604bb48c55174
font_01_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 17868 bytes
SHA-256: 01c3e7bc8f1a18c16811e5ff60870e7be0b8e57f97231433d5f00b0f945e3b39
font_02_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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