Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e1f5ca4422c4f4…

MALICIOUS

PDF

67.7 KB Created: 2021-09-24 20:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2561551178ea5312f75d4a8f8e231b8e SHA-1: 64df3841f96d4c0d0a333e81e81fce6cfa762540 SHA-256: 16e1f5ca4422c4f4f2e94898c26a7d9370fe50184118dcdf525dc5588c1adce0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-based content, suggesting it's designed to trick users into clicking external links. The presence of numerous URLs, many on disposable domains, further supports a phishing or malicious redirection scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://numismatika-nbkpdy.cz/userfiles/file/53458728040.pdf In PDF document text
    • http://sentai.cc/data/file/20210905_050805_113.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/dojolatipiluw.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/19990981582.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/45468872947.pdfIn PDF document text
    • https://jin-ji.com/upload/files/99213693033.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/v3kmogs839t94jmet5gcvn9fmd/fuxovilorof.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/61842895089.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/kakarutisufarutini.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/ginurirojizotatemid.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/bakujikidiluliduluvudegal.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/foweni.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/83478975478.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/volilotabuvokopar.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/98334091905.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/15518303858.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/64910960163.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xinonudujog.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/dupopefenomipolawesedi.pdfIn PDF document text
    • http://ridendo.cz/files/file/59604566934.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/puvemumobuwadajafikajoke.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d4893cfc---niduturafajososipad.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/xuzesiribuxodadew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bottle+flip+3d+game+freePDF 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_off0000ad94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD94 10796 bytes
SHA-256: caeb1201d7bbb31a2a9a0b772323f8c63f84d3a034f29dc950b5bcc8739f9d59
font_01_sfnt_off0000c63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63C 14392 bytes
SHA-256: fbdfc70cf01f34d434d3ccaf4800a93427e363c03488c784c59bd82e3137d82b
font_02_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1