Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee2a7d6dc71734b…

MALICIOUS

PDF

96.7 KB Created: 2021-02-14 09:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df5017a0e4795dc804c4532aed8a6db4 SHA-1: d97ad931318007f86b14e1490174a48bce99c70c SHA-256: 8ee2a7d6dc71734b2fdc128bef1bfd0d033488e8bc6f3603e845e83f244b992b
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and document structure suggest an attempt to redirect users to malicious sites, likely for malware distribution or phishing. No scripts were extracted, but the PDF structure and URL patterns are consistent with common phishing and malware delivery techniques.

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://jottigo.ru/wix?keyword=blitzer+algebra+and+trigonometry+6e+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482631/normal_5ff9edf4a6b00.pdfIn PDF document text
    • http://dazenad.iblogger.org/watologulixijikap.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/5977763.pdfIn PDF document text
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/fofavizaxami_lojuzutavu_zekokojokofased.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/Pjchcgg/spiritfarer_characters_list.pdfIn PDF document text
    • http://xidotamasaw.22web.org/netbeans_for_windows_7_with_jdk.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/wjjPvMk/business_administration_and_management_major.pdfIn PDF document text
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/xeloriwobigewiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415962/normal_5ff92af527afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_601a7c98b0bb0.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/Wighjhg/free_printable_coloring_pages_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/Uicgihe/17632066125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_600cec7af3d5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pupisovid.epizy.com/balarama_old_editions.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/cheap_android_phone_with_best_camera_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/powinetur.pdfIn PDF document text
    • http://mulazukaga.rf.gd/gevog.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/gib_aqualine_guide.pdfIn PDF document text
    • http://tupiremere.epizy.com/vebabelewimajiwoloj.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_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 5680 bytes
SHA-256: bfb620232624c35d251a06e190b15c78adaa8deb9e439a7bb4b3201407f5402d
font_01_sfnt_off0001442a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442A 14572 bytes
SHA-256: 079adfd78ec7a196189f383fad87d8631e25c25be47874211ce969b9c7065476

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