Malicious PDF — malware analysis report

Static analysis result for SHA-256 b510aedc35d93427…

MALICIOUS

PDF

75.3 KB Created: 2021-05-14 06:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e0c6f5c72fad065e448d084d8c6b84f7 SHA-1: ee1e5614e6056104ee12487f85afebd2f37c5a8e SHA-256: b510aedc35d9342763556be535b256a3f4bdb6e44cc9d8dda0ddda2ff577aae4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL leading to a domain associated with malicious activity. The document body, though partially obfuscated, contains text that appears to be a lure related to career education, intended to direct the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=what+education+do+you+need+to+be+a+marketing+manager PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451027/normal_60644ea989dcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5ff0753746516.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/m-audio_axiom_pro_49_software.pdfIn PDF document text
    • http://raisinshq.pro/28003172155c3e29.pdfIn PDF document text
    • http://investmag.org/how_to_program_your_firestick_remote_to_control_your_tvyl47v.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/bovowetofabutazuwevaw.pdfIn PDF document text
    • http://eliyalte.com/how_far_is_the_re_zero_light_novelt93ck.pdfIn PDF document text
    • http://xirapanagix.getenjoyment.net/tutorial_membuat_website_dengan_wordpress_offline.pdfIn PDF document text
    • http://itasummer.fun/manual_del_fusil_beretta_sc_70_90bm9my.pdfIn PDF document text
    • http://blankid.ru/how_to_install_britax_pioneer_boosterh92d2.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/kidifagokamunadotukuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxajez.rf.gd/90076328079.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/14941087818.pdfIn PDF document text
    • http://genolewedusu.myartsonline.com/ethical_conduct_in_the_workplace.pdfIn PDF document text
    • http://bagemok.epizy.com/sigagenowadulurewujesat.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_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 5464 bytes
SHA-256: 8378386b7b97c397735cdb86535dff0f94006b920978a98745a983754501f3bc
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 11068 bytes
SHA-256: 8779dbc60f6f638b2ea6db1f91257e19b506a3ff5f30749d241437d77d67924a

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