Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5781cf0c23c721…

MALICIOUS

PDF

73.6 KB Created: 2021-03-25 12:55:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 764577f77157c48ec7b8c74608b75f2c SHA-1: 5a33f67746680d1272751c5631acc652b9ad67cf SHA-256: ca5781cf0c23c721c84de154a5f8f72a84edba547100c7315b88f106b81b7665
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to other PDF files hosted on file-sharing services. This behavior is indicative of a link farm or SEO spam campaign designed to distribute malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file, suggesting it is a phishing or trojan distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/123?utm_term=mapa+pol%25C3%25ADtico+do+brasil+pdf
    • https://lidawutoroliv.weebly.com/uploads/1/3/1/8/131872032/xubuvabo-vuxujopaso.pdf
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/dimozuzuru-kipiro.pdf
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/81d06fc878d0cb6.pdf
    • http://pihodze.com/tofegulolaxiletton94.pdf
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/kakeritis_welalusowajiraf_panovilomuwafo.pdf
    • http://vufajed.getenjoyment.net/united_carry_on_size_limit_2019.pdf
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/penumezujebi_joduza.pdf
    • https://zaluzukefajol.weebly.com/uploads/1/3/5/4/135400247/6290411.pdf
    • http://e-devletodeme.net/tojelamorq8qt6.pdf
    • http://kzrovk.xyz/rainbow_vacuum_worth_the_price3q9zn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nixomirorubu.myartsonline.com/26995741445.pdf
    • https://s3.amazonaws.com/wexoteluwag/gear_circle_headphones_pairing_iphone.pdf
    • https://s3.amazonaws.com/wiwuxot/pictionary_game_free.pdf
    • https://s3.amazonaws.com/suzixegazunow/dowesiropikon.pdf
    • https://s3.amazonaws.com/vuxagixil/romans_doxology_sheet_music.pdf
    • https://s3.amazonaws.com/neporezofov/wordpress_login_for_my_website.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df33.bin
533842ac69fc4881dab5c8b9bc85278177c09425440d2b074d78b3cc5de3c60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 5348 bytes
font_01_sfnt_off0000f177.bin
6635eae61b2ebd983295b9c3ee0486d9e4647c0f3a219deb7d7dd82a73223bc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 11084 bytes

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