Malicious PDF — malware analysis report

Static analysis result for SHA-256 24638ce647e313af…

MALICIOUS

PDF

74.9 KB Created: 2021-09-26 03:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3b80c4242dae5b7e8625793c629d5f9c SHA-1: 3b368a5e7b85bc716c79382e8c77c76e547976f7 SHA-256: 24638ce647e313af48b3d29b28bd59ecd1dfdbf824cad38f0744917df4642266
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, which is a common technique for delivering malicious content. The presence of numerous external links, many pointing to unknown PDF files, indicates a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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://zapret-rf.org/web/img/podborky/files/46669044781.pdf In PDF document text
    • https://tmtteks.com/files/vobajijenawavupuxugaben.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/jipetefolekaxuborarol.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/vudomodikusikukawer.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/madidexatavebufogimesu.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/30824709386.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/41248445064.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/34708355493.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/74725460278.pdfIn PDF document text
    • http://steinemann-ag.ru/wuxexakas.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/25450360867.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/gitofaredar.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dacc7f4c6---66111180598.pdfIn PDF document text
    • http://germainelecocq.it/userfiles/files/49569163189.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jevog.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/xekemosusan.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/medosuwo.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/21315691663.pdfIn PDF document text
    • https://digireg.dk/upload/97936152210.pdfIn PDF document text
    • https://mimpidia.com/contents/files/suwiforamunosemulexo.pdfIn PDF document text
    • http://dejede.com/userfiles/file/59952459741.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/mavidepogutemugo.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/78837149100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=metamorphosis+novel+pdfPDF 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_off0000b88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88D 10824 bytes
SHA-256: e2c83d51995163cc8e7878dc2d137d010dce0f411265dbade6c692e4f9533592
font_01_sfnt_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 20256 bytes
SHA-256: 7fbc3f54f4ef2a79d6b4495cd1ca032d0613317aa694f780aa7b24723ca2ce7e

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