Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1912a65bf93bdc2…

MALICIOUS

PDF

68.2 KB Created: 2021-02-26 04:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c3e67df652a4e273ef89c7e384dcdde SHA-1: 9ed82cf0e76777b99f29aa3f80152449075e542f SHA-256: a1912a65bf93bdc2d797be33b6e15a9bb112b17ff2b8c4147295614b6e7a45a9
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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://druttle.ru/wix?keyword=camille+vs+illaoi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417827/normal_60053ec95ece1.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/rTharhf/amazon_store_card_login_synchrony_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_601999f44c2a2.pdfIn PDF document text
    • https://cdn.sqhk.co/divabasom/jghdghy/30827124179.pdfIn PDF document text
    • http://fojogil.iblogger.org/null_java._lang._nullpointerexception_android_studio.pdfIn PDF document text
    • https://cdn.sqhk.co/rufomezin/ahhYsOA/nuvafetafabinugavopibarod.pdfIn PDF document text
    • http://mosasekoz.22web.org/update_android_sdk_command_line_ubuntu.pdfIn PDF document text
    • http://labiluwewinedu.22web.org/adulthood_stage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lonozixugixapap.epizy.com/69595653984.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/class_12_maths_syllabus_ncert.pdfIn PDF document text
    • http://wajalapivibobi.epizy.com/adding_mixed_numbers_worksheet_super_teacher.pdfIn PDF document text
    • http://tosuniwenalob.epizy.com/53777683963.pdfIn PDF document text
    • http://damaxokabipo.epizy.com/25345502718.pdfIn PDF document text
    • http://mowigibimubepi.rf.gd/pokemon_diamond_walkthrough_guide.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_off0000d17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17C 4700 bytes
SHA-256: dab0016987168f8c3efc31b5fd36869f994b72616450feacc1dd533c7f676352
font_01_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 10248 bytes
SHA-256: f11ac8b86f7721b9d647999f089162b78e9e8352d81ff45fb18cb1c13732a558

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