Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ff7dd95156ad3e…

MALICIOUS

PDF

77.8 KB Created: 2021-02-25 22:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7af90d63849d8cc9f5646ca65e8e7adc SHA-1: cd6c66a7aef89d6d3b9e3ef11948b1a536914be5 SHA-256: 52ff7dd95156ad3ea4809b9a74a45b039e16c87f53be7a326cb165b7e73bfc86
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on 'seumenha.ru', which is flagged as a link farm on disposable hosting. ClamAV and ML classifiers identify this PDF as malicious, specifically as a phishing or trojan delivery mechanism. The presence of embedded URLs and the link farm heuristic strongly suggest an attempt to redirect the user to a malicious site, likely for malware distribution or phishing.

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://seumenha.ru/wix?keyword=happy+wheels+3d+free+play PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426572/normal_5fc647778880b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_5fd1c70df054c.pdfIn PDF document text
    • http://fofesivolu.iblogger.org/pezusegi.pdfIn PDF document text
    • http://desokore.medianewsonline.com/les_mis_2012_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423195/normal_600614a782f87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470837/normal_5fd061c65776e.pdfIn PDF document text
    • http://zikuwojanubeg.iblogger.org/ielts_essay_writing_questions_and_answers.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/how_to_charge_black_and_decker_drill_battery.pdfIn PDF document text
    • http://wogizejelalod.iblogger.org/survival_knife_animation.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/78125746423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wizifaj.rf.gd/dapixotifewisoxunufan.pdfIn PDF document text
    • http://tenurusimuxu.epizy.com/ativador_office_2010_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/animal_crossing_new_leaf_guide_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/vekuxegoxejokawupajux.pdfIn PDF document text
    • http://lutubipejor.rf.gd/fulotelirabigujokok.pdfIn PDF document text
    • http://runesufosufej.rf.gd/14277131209.pdfIn PDF document text
    • http://fapizof.rf.gd/vovagisufapemumerim.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/all_network_ussd_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/vosidakokalap.pdfIn PDF document text
    • http://kevikawimal.epizy.com/10175102051.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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 5448 bytes
SHA-256: 54b276e985c117aeb3f6cd368fec0c01e19bae675117802f8cac6d30b2f7c030
font_01_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 10452 bytes
SHA-256: db51ee3a67c0ff481def2a6aebb6bcf86140ac7e3d77dac1c129e985cddc4f73

Open this report in the interactive analyzer, or submit your own file for analysis.