Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f14781db4306fa…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 15:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db9942611e67ca1ae3645a45373fd66f SHA-1: b3d58bcbf826e82be1d3112e42be3079512aabb5 SHA-256: 11f14781db4306fa62526462b6e4c1cae41b462b7da36c0a3d3ade5863b3d66c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it's designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.zolmedis.lt/ckfinder/userfiles/files/putakajulum.pdf In PDF document text
    • http://zjleiou.com/images/upload/File/90819965394.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/53051918565.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae6949ab0---39032962251.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/285d9d8da879de15d3e044e8ecacbf7b/30566306846.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/63536763173.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/pevemakoguxome.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/38869706132.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/lokifixu.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/12204261562.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/51311016363.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/73685573670.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/696586445.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/guxizijoxuferejuz.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/83961811628.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/70600561415.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/87825704178.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/66863048956.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/79849493687.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/75308798292.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/4768799173.pdfIn PDF document text
    • http://lagrupacio.cat/file/vibulexitopobupef.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/40344519472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=english+words+beginning+with+ePDF 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_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 10576 bytes
SHA-256: e4bbb8d203df7e8a531ae105a2f0a6cbcb9ed81a41008067fd79477d26128490
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 17652 bytes
SHA-256: 02ef8958b1a8d3412991453cc8453496e528e348266ec23451197af7aaa3948b
font_02_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1