Malicious PDF — malware analysis report

Static analysis result for SHA-256 5567a20c03fea1b6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 02:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9ae5cae2febcbc99422190a49f7ac53b SHA-1: f42d263dc3c36bdd4b64a3bb35c55f5ed3c0c172 SHA-256: 5567a20c03fea1b6823d6ecc143e30f73349df1c6c1c2108347da54b29db21e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content, aligning with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=mini+war+idle+tower+defense PDF link annotation
    • http://orsini-blasioli.it/userfiles/files/mepufifuwajubebovotibibux.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/68352170620.pdfIn PDF document text
    • https://petribax.com/userfiles/file/sarasuxebumil.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/86905724310.pdfIn PDF document text
    • http://hainfelderteich.at/zekopepilate.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/vevawapevinajomelumux.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/40367835429.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/69897946421.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/15828031561.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/pukopiv.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/6412998638.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/kukoxotavegopejakuf.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/mukeruse.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/lorixifijipuxe.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/zojak.pdfIn PDF document text
    • http://belniig.by/public/file/zudalavumuxovesuxovejuz.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/55656399065.pdfIn PDF document text
    • http://mq-water.net/upload/gurovixufoki.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/48250167951.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/towasagexufuvarabamek.pdfIn PDF document text
    • 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_off0000b0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B8 10424 bytes
SHA-256: ae66fd546989b78b42312d55c8dfbc80c67ace16e38aeb78292f90c535df6e3f
font_01_sfnt_off0000c881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 16268 bytes
SHA-256: 883b0ce82c17a8e708218d8a64af5d06d113a7c5aaf17965b41ff52d2fdbbd21
font_02_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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