Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a7df810cf81a5f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 21:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b7e54e32a34e484f0caaa2f536df733 SHA-1: 891ea784bf6da4be54e20e5e410b5eb00dedf997 SHA-256: 15a7df810cf81a5f3cb0e9a1367ecc7000f8f4f7a4714a8587d8f7f778b31a1a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=topaz+hummingbird+wings+code PDF link annotation
    • http://bighost.vn/uploads/userfiles/file/86580277436.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/48915579861.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/60775321005.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/dilubunujepivanedima.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/toviju.pdfIn PDF document text
    • http://schubert-hh.de/image/file/48424688005.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/81081768788.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/67959704882.pdfIn PDF document text
    • https://fobh.net/userfiles/files/tirema.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/4fbe49433e4febbfe8481e5528484a17/48207406212.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/86800336172.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/30607478601.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/venuwowupo.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/79593260171.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/nemenakusaf.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/61536200324.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/91554140207.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/temiwefojixitirok.pdfIn PDF document text
    • http://wdnederland.nl/file/65310665363.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/27053382940.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/7637364551.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/33430375788.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_off0000ae3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 17776 bytes
SHA-256: d802024b4c1116db09de69b5ae8dcfc4d44a3367bce9648d2d72f1c9315109f5
font_02_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 11168 bytes
SHA-256: 70c43a4e409cc5ede269e448b30fa18cfbb6e465a1d3039ab0ed2634ef65bce7

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