Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fb2079e20a224e…

MALICIOUS

PDF

98.2 KB Created: 2021-09-20 10:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61966123e1692644723ee6f9a3d71f19 SHA-1: caf7d9989490ebf4a28300cff88b19351bbef582 SHA-256: d1fb2079e20a224e68390f52a812d075a72a502f9d5a46c0e887c574ed1a70b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.centralperdana.com/file/jigafiwawoxifitomasolalom.pdf In PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/gegusaviwewubiv.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/88346690200.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/nufubudusatafitazurofur.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/40570419022.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/sekaraxixesifa.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/97681167501.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/42365659114.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/pobazonusevoxiwajegilajaj.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/15963199772.pdfIn PDF document text
    • https://brs.jo/userfiles/files/84628874443.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ssg5f2dbvhfutaqre36gpri5qk/52411074218.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/38122823679.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/junugiloro.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/82666652852.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434cf6948fe---mojes.pdfIn PDF document text
    • http://isgsrl.it/images/file/tatawazufobomojo.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/wuloka.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/65266401113.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/fisuwaginetudolenumabuzir.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/denoxalolup.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/97303997271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=angry+birds+comics+pdf+free+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_off0001165e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 11188 bytes
SHA-256: bc25d8bec6592c8a34688e62c270b182e54178ff28de66585fdc94d47b002bf3
font_02_sfnt_off00014845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14845 18696 bytes
SHA-256: 9c3cc036d926db5851d607498f24b4ecb1274a92b4650523097c826ec5c596a0