Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a800a4cd7a4eaa…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 00:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 937dbdd6a634b53dc84b34690ca10788 SHA-1: 755cc18de1ca21cb5bf619a7a375ebbb2b3c37a0 SHA-256: 57a800a4cd7a4eaa017c7fa7056d7f00b36a8a0e7b6161fe591240a4e55f0029
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs pointing to PDFs on disposable domains, coupled with a high ML classifier score and ClamAV detection, strongly indicates a malicious phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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 https://mobilpetrol.olajpark.hu/files/files/najuvigufagikuserupir.pdf In PDF document text
    • http://tpdw.pl/userfiles/file/renusosafoposane.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/23987888204.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/84889230973.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/82222475066.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/80245211154.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/84302584350.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/zosudararamuzuvebaz.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/39235292729.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/6055161327.pdfIn PDF document text
    • http://glttek.com/userfiles/file/xorul.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/xuwazenutarerog.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/94985165829.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/wazevipuzunude.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210901060753.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/fatotewatin.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/57415375060.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/lobunigadabolapipata.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/96279251751.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/52453979161.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/gitupiburojusediditite.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/43800067343.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/papukexefivawaxopatok.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/bomamepudologukenigipepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=latitude+and+longitude+camera+app+for+androidPDF 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_off0000ae62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE62 10852 bytes
SHA-256: 68a90500f55e44c932ac96a40e9f3ce51e5810e66d850d4d625f48855628d247
font_01_sfnt_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 15300 bytes
SHA-256: b2642325a2629f99f327b2a6d09a9fe683ec00ae778cedd7a202592ad4cfb896
font_02_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1