Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbd29f00292ec27…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 12:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f51880ad01233ad9480861280d85dc72 SHA-1: 40f2a5840347aa6d378a2007b1f4c6e423a86311 SHA-256: 8fbd29f00292ec27f2f9e62168ba57b7dbc6853afee88efe0f6896595808e664
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many hosted on disposable domains and utilizing UTM parameters, strongly suggests a phishing or link-farming campaign. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=motorola+one+fusion+plus+live+wallpaper+download PDF link annotation
    • https://pielinks.com/UserFiles/file/lifowusa.pdfIn PDF document text
    • http://firegallery.ru/img/upload/lezevomezivajutemaleb.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/zopofogexijotuni.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/robebe.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/89708833208.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/237733089.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/47975164601.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210927163272992788.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/kubiwawinokupabilege.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/fevenelikeziseki.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/sesemidagokeserur.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/64420150452.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/duditebipojupunu.pdfIn PDF document text
    • http://wsm.hk/images/files/83372562610.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/9258538936.pdfIn PDF document text
    • http://nanjing.chinatupai.com/web/js/ckfinder/userfiles/files/zogebipuboku.pdfIn PDF document text
    • https://lapakunited.com/contents/files/96164322672.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/86400174308.pdfIn PDF document text
    • http://risme.vn/files/62070083198.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/judamuzararud.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/fenulub.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/65426566560.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_off0000b074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB074 16604 bytes
SHA-256: 2b7512621d3a68f0702d3f9e82db867e1abf69d3b64eb675a77a49a5a68971f1
font_01_sfnt_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 10736 bytes
SHA-256: 522508d11a55520e13bfb513c1d9e334ebbb0e3a1b407e14957507aeadcfa26c
font_02_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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