Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cddd7673f14cc5…

MALICIOUS

PDF

73.7 KB Created: 2021-10-09 13:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e1c9e25f7601f56012545aa7293f60df SHA-1: 01693c9c57ed830fe531ce06775328287dde0a9f SHA-256: 68cddd7673f14cc542ebe85d0baaccaa38482de9332fba179b0b96b1bf692bff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://fabtur.ru/upload/files/defen.pdf In PDF document text
    • http://brianhaymore.com/images/e/file/ratik.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/75602333007.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/vekomogimak.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/vipilazifegivosasepuxik.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/sedekib.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/93553196419.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/dinigirifu.pdfIn PDF document text
    • http://szhlfz.net/upload/9044029063.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210911132021.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/musapemebanotumezom.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/30466860838.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210910202220_gdvya2.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/supigizinono.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/merezebuzibozeveso.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/54938488647.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20211062353230059.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/werexeviludekazijireme.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad2d1cdb25---firanozesoxejufizor.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/duzugapi.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/54075079888.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xavuxonidixurogene.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/63763529322.pdfIn PDF document text
    • http://hasyo.net/files/file/58272928807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wow+classic+best+hunter+pets+for+levelingPDF 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_off0000bc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 11144 bytes
SHA-256: 3f406a757b0103566cd11b732546be63ff1f71da40f159f5ff6f8db79c26542c
font_02_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 16400 bytes
SHA-256: 8372be930c8c148e5879a49e71155696348d16fe88c248507ccd2203b666006e

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