Malicious PDF — malware analysis report

Static analysis result for SHA-256 337dc45048d9855e…

MALICIOUS

PDF

89.1 KB Created: 2021-03-31 16:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 105fcc28c41f7f41cfb50e412ff94360 SHA-1: cdf138aaa6931e33e097ee63621b4fb9b5a8e9d8 SHA-256: 337dc45048d9855ea2762add84cfe897307c0b719c4b7a446708fc98e0d786f3
144 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a download page. The embedded URL and the high ML classifier score strongly suggest malicious intent. The ClamAV detection further confirms this, identifying it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a document, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/award?keyword=canon+lide+100+manual+pdf PDF link annotation
    • http://gevejune.iblogger.org/anemia_hemolitik_imun.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/e0OheIC/motown_music_radio_station.pdfIn PDF document text
    • http://pukujadud.getenjoyment.net/tomutezivuxofoporiw.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/rhiUgcD/57443136431.pdfIn PDF document text
    • http://suvolupijiro.mygamesonline.org/probability_and_statistics_2_notes.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/brandon_sanderson_store_promo_code.pdfIn PDF document text
    • http://kubevevof.iblogger.org/98779989970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kazibejega.epizy.com/the_wahls_protocol_book.pdfIn PDF document text
    • http://nivobilov.epizy.com/hero_movie_flute_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/nurizizuxukanunakulaluve.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/95300098728.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/37714460549.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/wilatasivoneg.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/lizunexuzukupedoz.pdfIn PDF document text
    • http://lomuxisopu.rf.gd/dututi.pdfIn PDF document text
    • http://sexikiti.epizy.com/who_makes_rheem_furnaces.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/zivilonabeware.pdfIn PDF document text
    • http://vedogitunenaki.rf.gd/lozebetenuj.pdfIn PDF document text
    • http://naziniri.epizy.com/vamonemupixagikux.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 5012 bytes
SHA-256: a0b7cb52cd06c226026471709f3301f9e778f468e8f79f69b9a4bf70119e610f
font_01_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 11480 bytes
SHA-256: 8576930e7dc2e18ce44e2c270380c49792e058e44dd2b7fc287e75f76873b338

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