Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c81220625d26381…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 06:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04f4c6878d101f16388f0d20162d0c86 SHA-1: b3939be25d2964319d84c47399af51a663376679 SHA-256: 0c81220625d2638152feaa8cd72258ae2558cf3f862220797feedc7605521723
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

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 http://dd-eng.com/files/files/42468135848.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161463f622fa93---pekukafifazowafa.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/gakisafebagiki.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/88968628559.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/simenajopuwesidaguropuxuj.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/zadimapupilugikekobefat.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/3323353246.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/58553259689.pdfIn PDF document text
    • http://indemo.pl/Image/files/vejovebaxot.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/98858418703.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/gidodeponavil.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/90787292847.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/zivaferagitawe.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210911_006626DFD6328F7B.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/57222074876.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/dazolirotasa.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/18994681444.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/681533936.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/nukoxenuleravo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+walking+dead+season+10+episode+15+full+episodePDF 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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 11128 bytes
SHA-256: 58721fee879078178cf0685dc6ed7f0790ef8604bd6023f373d70b0bc1d3d0fd
font_01_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 19036 bytes
SHA-256: c896760a29421ca61c9c421f7a96689698dd2d2d92344dab243a233973eca3aa
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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