Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e37fe5671a6c74…

MALICIOUS

PDF

70.8 KB Created: 2021-03-22 22:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5b056aba285a9d1245679735927d5c8c SHA-1: 6ea9ebd1173fe0dc8297e22e0d01f569839cf956 SHA-256: f4e37fe5671a6c74db660b6f69c2de5d7cae0e5eb80653ab07b8c45b92da2131
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=lonnie+b+nelson+school PDF link annotation
    • http://wivaserana.mywebcommunity.org/ciencia_ficcion_definicion.pdfIn PDF document text
    • http://jepatugikanoxuv.iblogger.org/42017532425.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/hjigdz6/pekiloboboruwiwedupirod.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/ahgXVNc/candy_movie_2017_trailer.pdfIn PDF document text
    • http://dasezin.getenjoyment.net/tavepezivapajowixudutinis.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/spectral_graph_theoryqcqnc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470526/normal_5fe41ffd9f5a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60216a3fddb05.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/hdhjgcl/611832086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_604d3917080e8.pdfIn PDF document text
    • http://erogancolumbia.site/22590243437mjtvd.pdfIn PDF document text
    • http://ipai.online/los_7_habitos_de_las_personas_altamente_efectivas_gratisg52tt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foweroboxufafuv.epizy.com/alan_wake_pc_game_highly_compressed.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/20758003456.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/dangling_modifiers_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/repair_ingersoll_rand_air_compressor.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/formal_dress_patterns_for_ladies_2018.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/how_to_program_my_universal_rca_remote.pdfIn PDF document text
    • http://nedafab.rf.gd/54327140894.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/36858726675.pdfIn PDF document text
    • http://rusesav.rf.gd/75950242339.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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 4660 bytes
SHA-256: 25d9eb9e60a75ba84e3199aca6216cbaf2b1d5989d45afaebd55f0815830b4c1
font_01_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 11004 bytes
SHA-256: 4d303f883fcc08fd68175ba4608e95d3675e1b622a5c8d5d6b1380ba5dd6809a

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