Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fac3a5acfaff7f…

MALICIOUS

PDF

80.5 KB Created: 2021-10-05 20:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ba78734410bccd8dbd93a718e6d41e4f SHA-1: d5d48fa8ef5161696934f0deea0409960a7598e3 SHA-256: 03fac3a5acfaff7fd1d83fdeec7c22c9621378454e2346423067d92ef021285e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://synerhu.ru/uplcv?utm_term=describe+yourself+in+one+word+best+answer PDF link annotation
    • http://zygzak.eu/foto_dane/wysiwyg/File/zifexuxebusitutet.pdfIn PDF document text
    • https://mysilofr.mysilo.com/upload/ckfinder/files/mijopupadezejekevile.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/33554343425.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/ragurabazemuxojajipe.pdfIn PDF document text
    • http://teraval.cz/res/file/bewisedoveda.pdfIn PDF document text
    • http://pvvc.cz/files/53968127174.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/25328553961.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/nubomipasokomilov.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/kosiwagetulen.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/76573417044.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/60323967226.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/28417518287.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/22043456787.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/xusevadobadekamega.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/29292893113.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/wotagemedenomiki.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/6628152452.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/nepegit.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/45649308786.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614032b323a6d---kifobexasotedoxunemus.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/0a2c28e17dc6c0edfb37da003093f194.pdfIn PDF document text
    • http://thongthien.vn/upload/files/dazivefibemi.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/wutelagapupir.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_off0000d40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 10908 bytes
SHA-256: ae90277f892d6bd91d61560adcb01582b9ee8898f1089caf5d8460b1d41e4d80
font_02_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 18452 bytes
SHA-256: 8650c2470d2b0c09142e1a310c6e60d27bf78c6532c2fc6bfc898416239f7a0d

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