Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7edb77dfd4b506a…

MALICIOUS

PDF

75.4 KB Created: 2021-04-02 20:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc8a6e86a842e0fa34a65743e716659d SHA-1: b82ea3ca6b19eb1846e481cabcebda74d3efc890 SHA-256: f7edb77dfd4b506ac20b3f75f822887b8c9008451b33b42a1ee4e7186d744a51
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, specifically 'https://midufefew.ru/wix?keyword=free+auto+backlink+submitter', suggests a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing attack, likely attempting to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=free+auto+backlink+submitter
    • https://duvujisukodat.weebly.com/uploads/1/3/4/6/134674851/bozoma.pdf
    • http://maturibcgj.space/gawakojopolezix0c6wf.pdf
    • https://cdn-cms.f-static.net/uploads/4443372/normal_60188dbb9a2a3.pdf
    • http://mixed-rootwork.com/excel_vba_range_find_daten8hp3.pdf
    • http://repair-foto.ru/ielts_speakingov9sj.pdf
    • https://cdn-cms.f-static.net/uploads/4455374/normal_60229f247d619.pdf
    • http://itfamily.info/wu_tang_clan_aint_nuthing_ta_f_wit7hi6n.pdf
    • http://setopin.mypressonline.com/what_does_coronary_artery_stenosis_mean.pdf
    • http://faceskinagainbeauty.xyz/87037112785epdbt.pdf
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/rawixizisuzagokajera.pdf
    • https://cdn-cms.f-static.net/uploads/4419191/normal_60341ba94689b.pdf
    • http://bigowet.xyz/rare_beauty_selena_gomez_ulta39brk.pdf
    • https://cdn-cms.f-static.net/uploads/4490123/normal_601621721779e.pdf
    • https://lenumerizak.weebly.com/uploads/1/3/5/9/135962539/gosuxugoni.pdf
    • http://mkuu.club/bapirulld00m.pdf
    • http://xilibinebosapeg.mywebcommunity.org/lanusebawafedawusake.pdf
    • http://infonewstravel.com/button_html_onclickxhd0m.pdf
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fc87e445d65e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4f1064f3-c34c-4a20-8341-f37da48c2a3e/new_king_james_version_bible_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/6381fd2b-0f8b-473d-9a0d-d190518b5447/10590142777.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_off0000ea32.bin
8260880ece5a380b27167530f275d7e436b9f9ebdb0734510ec195b75ba462be
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 5104 bytes
font_01_sfnt_off0000fb7a.bin
b5338fbfa9681e9a88d9f938e0b8e8345152799544e0aa759adcea646090cd0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 10900 bytes