Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90a9a3a2e99a8e6…

MALICIOUS

PDF

84.6 KB Created: 2021-02-25 19:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 130f10148b84edeb655fee36f49431b2 SHA-1: 7ecf00093c6b831a87e0799188d75b4c0a644788 SHA-256: a90a9a3a2e99a8e6d1f19b4efb7ae17cda1ce465f74182390344a992bd5de80e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://jottigo.ru/wix?keyword=ff14+wind+tea+leaves PDF link annotation
    • https://cdn.sqhk.co/xinovupu/cDsbjcG/bekanogitekiwevimuvot.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/cggH6he/88840811230.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/fhaRigK/fimixiduwebovola.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/iheichg/shark_ion_p50_ic162_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotefi/hpgi52t/quick_and_easy_dessert_recipes_with_apples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_600a12fd00b41.pdfIn PDF document text
    • http://lujuvudav.22web.org/associer_entre_eux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujotipaxoxi.epizy.com/barclays_gender_pay_gap_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/36041957461.pdfIn PDF document text
    • http://rasunafosav.epizy.com/fozolizezigifojowuwe.pdfIn PDF document text
    • http://maboduxivugiv.rf.gd/word_association_test_sample_papers.pdfIn PDF document text
    • http://wemurabasuxekux.rf.gd/nevuveseri.pdfIn PDF document text
    • http://xagunege.epizy.com/rac_breakdown_cover_uk_policy_booklet.pdfIn PDF document text
    • http://juxudawalugevop.epizy.com/angle_relationships_homework_3_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 5052 bytes
SHA-256: 0b2511ffc228c104639722f5b05480ff4c49c3e8d73e50d8f65b7a6a39e8d029
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 12536 bytes
SHA-256: aee5e80903172b4244c975c23b4aabe1d533035ae0eab1e8548fb870ed03e36f
font_02_sfnt_off00013065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13065 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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