Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15c2d2ea986e6c1…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 13:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fb186694156d4940b2baab9a06549cd SHA-1: 8232c739a4064166869c2e27db1c920cfd2fae8b SHA-256: f15c2d2ea986e6c1d8d16a08c89e112963e44af9f70b79e462e0a426cdff9758
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_IMAGE_LURE heuristic suggests it's designed to trick users into clicking on an embedded action, likely leading to a malicious URL. An embedded JavaScript stream was also detected, which could be used to further exploit the user or download additional payloads. The numerous extracted URLs, many hosted on disposable domains, reinforce the phishing and link-farming nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 69 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 https://alley.52886.tw/uploads/files/13192942076.pdf In PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/32079341101.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/29664901621.pdfIn PDF document text
    • http://changzhou.chinatupai.com/web/js/ckfinder/userfiles/files/59197545898.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/73717080659.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/tirinaxejotosudim.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156f2c159019---fedakinufogupekiwoz.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/keduganozebigeredokini.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sokinino.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/jomadizovosomukamaxejebub.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/kokovevasojipiwaxoxapewik.pdfIn PDF document text
    • https://wasael.com/userfiles/file/guserifaz.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/gatelarogibe.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/kelefenepubo.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/bokeravofav.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/nulidinakimubane.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/22853449924.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/36949666562.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/masadosiziwogolozu.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/betujamiruwemedakisibo.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/42273531616.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161581170809d2---73552281607.pdfIn PDF document text
    • http://4bx.pl/public/file/55430302616.pdfIn PDF document text
    • http://onelove.cz/file/15501524213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+the+good+witch%27s+destiny+full+movie+online+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_off0000ae80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE80 14388 bytes
SHA-256: f8ae01ce2c24ad0fc40825dc4e582168be800801c647fefef8b13b32604ca4cd
font_01_sfnt_off0000d259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 11316 bytes
SHA-256: 029ac0ac8ceba03c89193eb5838a54f0e130da471b9e0e16a279813eee444028

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