Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76515731892b8b0…

MALICIOUS

PDF

66.7 KB Created: 2021-02-20 11:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5a6bb4a1785312874daa80abc62893f4 SHA-1: afadd4ba8cd47a0232f899412c236fbf7fba73a0 SHA-256: f76515731892b8b00db9f8666836012215bddde62d07cd821788dfaead249eb3
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that discusses printer toner reset, suggesting a lure. While no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, and the presence of external URIs indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wb?keyword=brother%20hl-2270dw%20toner%20error%20reset PDF link annotation
    • http://elinekici.online/66588629589znvk4.pdfIn PDF document text
    • http://ellmax-site.xyz/tirutewaxigoporikejapeqkdzf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_6015949acb6dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jobavo/riguvanujugujog.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/genossenschaftliche_finanzgruppe_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/6843039727.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/reddit_frugal_car_buying_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/best_animation_apps_for_android_2019.pdfIn PDF document text
    • http://joposib.rf.gd/attu_movie_video_songs_free.pdfIn PDF document text
    • http://safuzidavoje.rf.gd/87515642056.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/adept_verb_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/bakers_square_restaurant_nutritional_information.pdfIn PDF document text
    • http://lefivagalowo.rf.gd/lakita.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_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 5232 bytes
SHA-256: 4d7b9d71c7efc3d1ffcdecd5b3bf4f85a6b666f9230c56aab6502d4cf14aa96d
font_01_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 10056 bytes
SHA-256: ef2238c9970eb6fd9490749d4d765ba51fa35ff2b0e95eac1853463237388c94

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