Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5c5e5821032045…

MALICIOUS

PDF

70.8 KB Created: 2021-02-14 13:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8eac986eecc73b24f3eac0f1e0d512e7 SHA-1: 62eb247d56105f0e859f0f1a7724cc2785ec706e SHA-256: 6a5c5e582103204521c4fe8b1dbc364e633d1a0c341479e18d24387f50937260
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The primary URL, https://baarspo.ru/wix?keyword=mixed+gas+laws+practice+worksheet+answers, suggests a lure to disguise malicious activity. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially malicious 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/wix?keyword=mixed+gas+laws+practice+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5ff9ec98ce7f9.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/bd8c4e21c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5ff26a26e2477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493917/normal_5ff1df1dac58a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409619/normal_5fc601f0214d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_60150dac6a513.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/863419.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/7107628.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_6003dbdd7477b.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/0a5abf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/british_gas_smart_meter_manual_reading.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/53733383247.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/asc_842_lease_accounting_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/3732363085.pdfIn PDF document text
    • http://vopipewulowapa.rf.gd/wiwafositibi.pdfIn PDF document text
    • http://nevuwomekemetil.rf.gd/simelegojaxonewedew.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/67420555928.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/memunawerexezepufiku.pdfIn PDF document text
    • http://wabiraxo.rf.gd/ashrae_acca_standard_180.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/manual_grass_cutter_bunnings.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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 5564 bytes
SHA-256: 92286c1dd6189b300bc3ef943234cd46d22c8a9abb70c4b5044a40dbf4cab62a
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10124 bytes
SHA-256: b0b40d95556b288451d4b6a9453100b79ae09571476beb3f86cdfd7c0d8a58ac

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