Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63607c7653c98f7…

MALICIOUS

PDF

78.4 KB Created: 2021-02-23 06:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 04bce3efab6e7d4020802b5239502d21 SHA-1: bdd5646f2cff57f48ce878e26998bde9a769ce71 SHA-256: a63607c7653c98f73b3e999973b5c8268092e7faab3ac1f3afea293b278b0de3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://jacksth.ru/wix?keyword=filibuster+example+ap+gov PDF link annotation
    • http://titalat.iblogger.org/wosofesuwupowubolovow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494147/normal_5ff1ce5ee672d.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/8c29fa75c515cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5fd8f4f88d82e.pdfIn PDF document text
    • https://cdn.sqhk.co/libudezetuv/tjd0LqC/wepejitigoz.pdfIn PDF document text
    • https://cdn.sqhk.co/sijoputolu/ShhM6O6/36940042455.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/AOjjhal/84506179142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461525/normal_5fc7bb77bd908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_601f901016726.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/CVjjid1/xavorufesikerisevoxigi.pdfIn PDF document text
    • http://tejifepubodol.iblogger.org/small_water_pimple_in_mouth.pdfIn PDF document text
    • http://nizuloxodiza.iblogger.org/69264964776.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/3feed773256ec5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofifalog.rf.gd/bayou_classic_fryer_manual.pdfIn PDF document text
    • http://gawasaxe.epizy.com/89745542072.pdfIn PDF document text
    • http://zevovalik.epizy.com/zipurepilifawi.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/earth_systems_spheres_worksheet.pdfIn PDF document text
    • http://jumebesatupa.epizy.com/minecraft_technic_launcher_chip.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/20848323790.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/62992161087.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_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 5364 bytes
SHA-256: 43612000901c408977cd8a58361dbf0e22000f788bac1d02d5094e12a7bc91be
font_01_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 10160 bytes
SHA-256: 4dc26ab397bf86fcde03d6ef852d6885f60cd1315f3e7bd1bad63e6ac51a3581

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