Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8a1c9eb5ea8bb1…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 00:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bccd86ce2f9ff7c9447a0d3c4227eb03 SHA-1: a19c80668d9d90a23bcf5bda11ca20c5b5a925d6 SHA-256: 9b8a1c9eb5ea8bb11af76a3883c0d3ce2b9d6c506fb66719becda5183e7c94ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or content-luring campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://net-work.cz/data/file/89542312826.pdf In PDF document text
    • https://ofcourselc.com/admin/uploadsfile/jusewegupekusagezuki.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/93856709290.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/josusunutefeb.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/21580453666.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210926224355.pdfIn PDF document text
    • https://penal-garazh.ru/files/gelanipubakixafuzafizopuj.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/23513832446.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/fewozugaxesutimexezule.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/parufaxukufutis.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/bamofeponidutuge.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/5466310251.pdfIn PDF document text
    • http://iphysiology.ru/upload/kiliwogog.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/21436876926.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210909202328843.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/10780402844.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/58522011489.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/43339902153.pdfIn PDF document text
    • https://casaalu.com/luutru/files/19649368555.pdfIn PDF document text
    • https://12shio4.com/contents/files/41814110045.pdfIn PDF document text
    • https://penal-garazh.ru/files/71523020062.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/84146667971.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d591bda0---favaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=manual+differential+blood+test+resultsPDF 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_off0000ae04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE04 17276 bytes
SHA-256: 591a3bba45122f7352b49536b5b0555e81ea6e7af94542776861aaa73603c600
font_01_sfnt_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 10580 bytes
SHA-256: ff5a8c629f30d39464997bcb7aee89cc76903329ca8fce095e84bcfef996a8e4

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