Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0658b852121566b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-23 17:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d022b35f5ebc8226dd2cc078f95cdc16 SHA-1: e697d34de5ac0eb5a8be4fe26ae0043132cb85fe SHA-256: d0658b852121566b776f00f2dfb4039dbd7ad954bbb945a5c667b04657371901
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to external domains, suggesting an attempt to redirect users to potentially malicious content. The PDF structure and embedded URIs indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=betsy+braddock+captain+britain PDF link annotation
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/zuwarusibubokiligejuroji.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/rikasodazisedotil.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/kukamivire.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0cd99050---75725879527.pdfIn PDF document text
    • http://davcpundri.com/css/file/85062026768.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/bujuviniteragelu.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/wenubofivolanizoxolen.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/75454404292.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85184e8eb---1766171781.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109181809583364.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/50383019066.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/joragitobisokona.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/noxos.pdfIn PDF document text
    • http://olympusflights.com/files/files/4221551690.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/dipeluledufosobi.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/73129707610.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/vigegorizabekodot.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/buwuxizasadaxaja.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/78728395183.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/fukavuf.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/gonibubef.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/videsinulafezumuzifaf.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/jobisapijidimapis.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_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 10860 bytes
SHA-256: b0f77416ba61649bfcc1a9bcde36d423577f807626efbaa430e8524e6274d90f
font_01_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 17376 bytes
SHA-256: 269b2b6fe185db891c4dee8985eb3444dc609068a22e9f708e1970bf6a37cb2f

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