Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca87c98ba5632ef…

MALICIOUS

PDF

76.0 KB Created: 2021-03-22 23:10:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4ffd2ee7db5e6db483834ba04078383 SHA-1: 740db5a11fe8173a0106bd07f2bc6d2e7bc4d4f8 SHA-256: 9ca87c98ba5632ef34b5aedb252381c391e3a84e58468af7d180ccc9e9945669
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and ClamAV detected it as a phishing trojan. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest a phishing attempt designed to redirect users to malicious content.

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://ponafet.ru/123?utm_term=creating+forms+in+bluebeam+revu+2018
    • http://povoponikevave.iblogger.org/the_mists_of_avalon_audiobook_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4389394/normal_600559f1d9f94.pdf
    • https://cdn-cms.f-static.net/uploads/4423154/normal_60537177985b6.pdf
    • https://static.s123-cdn-static.com/uploads/4405687/normal_6007e5d825983.pdf
    • http://bunutib.mywebcommunity.org/early_effect_in_bjt.pdf
    • https://cdn-cms.f-static.net/uploads/4471488/normal_602869e51b206.pdf
    • http://womizepivilora.sportsontheweb.net/arain_caste_history_in_urdu.pdf
    • https://static.s123-cdn-static.com/uploads/4385880/normal_5fefaa96291f0.pdf
    • https://cdn-cms.f-static.net/uploads/4369914/normal_602c2a4f2050e.pdf
    • http://idealica-columbia.site/17175013858optrk.pdf
    • http://bitcoinlearningcentre.online/mikedilojiboluwo2gq57.pdf
    • https://cdn-cms.f-static.net/uploads/4365540/normal_604d23668d30b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://guvenaverelud.epizy.com/91313293060.pdf
    • http://mowiwanafiv.epizy.com/37052750748.pdf
    • http://xinudigiwuwa.epizy.com/fizobaxodilavodoxadituzak.pdf
    • http://kosigasarem.epizy.com/what_are_lines_on_a_graph_called.pdf
    • http://paborijobo.epizy.com/chiari_malformation_surgery_mortality_rate.pdf
    • http://sedobuxekazadi.rf.gd/33389694891.pdf
    • http://lojuwuwa.rf.gd/games_lego_batman_ps2.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_off0000e8d8.bin
2493f55aae7c07e8283ef17f494f655d89181aa27cf6e1e3086048bee6dd5298
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 5712 bytes
font_01_sfnt_off0000fc3e.bin
fee10a48b6338422325ab2e38307ab3bcb7a9eba534210295557c217cc68efae
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 11312 bytes