Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93428abb3f22c1a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 05:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42666b87d592d872502af91e3c6cf5dc SHA-1: d24ecec7354221195f6780055c041be4fd5a5517 SHA-256: f93428abb3f22c1a0eeeb370c0926fb602b3847dbfef82b6514d0ae38babd69c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, with one directly pointing to an IP address, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://carrozzeriardue.it/userfiles/files/pibisubopedalowanela.pdf In PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/fiwojusepekumowugovep.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210908055922.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/fejegosezukufat.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/gusetarefaxewetepux.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/27106620858.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/rexuvitonojavajoroviwabug.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/63207321519.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/toxuvolizadase.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/64505157676.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/23771ff675c62144ea6daea13215b438/73173711404.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/babapuvixotekix.pdfPDF link annotation
    • http://lycee-elm.org/userfiles/file/17561388216.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/vosimuti.pdfIn PDF document text
    • https://value.ae/userfiles/file/dinarewu.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/13487970187.pdfIn PDF document text
    • https://suksesunited.com/contents/files/weboxupolewef.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/21487220467.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/fagosiwusidewefamija.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/detawotutamolojijal.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/72373834075.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/16211835801.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/didagigex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fm+radio+for+android+without+internet+connectionPDF 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_off0000c49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49F 10688 bytes
SHA-256: 606bb922dc5c67ab58b6c80368251cf41f712385d623c7d8ea6d68bc9b66d03f
font_01_sfnt_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 16532 bytes
SHA-256: fde547e7f65f601df9d946aeecdbabe7caad4af1c7407d668aa6f7571ad35c7d