Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58eb3f532dead75…

MALICIOUS

PDF

65.5 KB Created: 2021-02-13 04:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 514128c37f58a4374b019a102c973cfc SHA-1: ef5b67f7619befc9424e76eb23265b087829e0cb SHA-256: a58eb3f532dead750634ee7b8001c4bd234768488091a5037d818f99095c45e9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://crophysi.ru/wix?keyword=gcss+army+self+registration`. This suggests the document is designed to phish users by directing them to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links is sufficient evidence.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wix?keyword=gcss+army+self+registration In PDF document text
    • https://cdn.sqhk.co/xisalaximel/ejjNhaA/best_app_to_learn_english_grammar_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/gVhcahg/crash_car_pc_2019_nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_6023124de9cd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420907/normal_5ffa1fac44dda.pdfIn PDF document text
    • https://cdn.sqhk.co/gasawivu/jcMFigh/this_song_hit_different_meme.pdfIn PDF document text
    • http://dajinanumiki.iblogger.org/aasld_guidelines_for_hepatorenal_syndrome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_5fd22f3689fbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418788/normal_6005d9d88ef53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464541/normal_5fcbaac6aa4e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452861/normal_600740cf7c4ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5fcc1f4e9aa10.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/gomakobez/kerala_floods_2018_report_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/bathampton_manor_cqc_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/state_cooperative_election_commission_forms_kerala.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/crime_report_form_listening_audio.pdfIn PDF document text
    • https://www.gcss.army.mil/Documents/Notices/PortalAccess.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_off0000c501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC501 5332 bytes
SHA-256: 92bc4154f66a2df9f4e2e2cb61c806306f512531981279627c430957fb3d6400
font_01_sfnt_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 10032 bytes
SHA-256: 65c94f34eb73a4c95cfb2e79e07ecc7b0548c9995e0343e67a1ea07589403839

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