Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11fc655bf3840f4…

MALICIOUS

PDF

79.6 KB Created: 2021-03-19 14:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f8bf9597ecc778393cdc42769e3a579c SHA-1: a41202ca3ca9afabc8bf7f0f92e10bacc13eae55 SHA-256: c11fc655bf3840f40994c9a3e0f6656fb40f128d17e9c210b81489c6c26b2aa9
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains suspicious and known malicious links, suggesting it's used in phishing or to deliver further malware. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly support this assessment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://yafferge.ru/wix?keyword=abecedario+en+ingles In PDF document text
    • https://cdn.sqhk.co/pofoxubo/vyhaTia/hunter_s_thompson_objective_journalism.pdfIn PDF document text
    • http://argo-tourism.com/spring_framework_version_upgrade6uodn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_6049cae302324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451567/normal_5ff661e77ed8c.pdfIn PDF document text
    • http://itdiscount.pro/ruxasefijuronukegomumex07qmo.pdfIn PDF document text
    • http://stroiline74.ru/875785956058nz4u.pdfIn PDF document text
    • http://otshelnik.net/how_to_edit_imovie_on_iphone_6fnx1w.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuxilav/gi1EH8n/tawopigadavedobikufu.pdfIn PDF document text
    • http://netewe9.xyz/zikumesetefekoli37mxv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_604ab8692305a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_604cdedb43b86.pdfIn PDF document text
    • http://ig-supportcenter.xyz/4764308347608gy4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_5fd94a044e74f.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/mejobu/madrid_royal_palace_guided_tour.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/binary_to_decimal_conversion_method.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/madej.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/busuvivugobotikibuwexuze.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/camping_merit_badge_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/chapter_9_progressive_era_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/93605135781.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_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 5236 bytes
SHA-256: 57aa8b76b03b62eecda87e788970351aff7a158bfee6deb8feb04844b738c951
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 12944 bytes
SHA-256: 71de7c4bec18f79a5cfcc49bebe0efbf0ff7928cf055c9cd99b650edb67a733a

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