Malicious PDF — malware analysis report

Static analysis result for SHA-256 b677e979e5b8c94a…

MALICIOUS

PDF

66.9 KB Created: 2021-03-18 04:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 461958af8a286e385fbc4d1a7d511cbe SHA-1: ee7fa0f96f801cb8cff5b6ab87c076f327df0891 SHA-256: b677e979e5b8c94aa29a9f1edc31f4c35a293291150db6322f4c5c7a1c3d054e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on Weebly and appear to be part of a link farm designed to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further indicate malicious intent. The document body, though heavily obfuscated, contains references to 'apk download' and the authoring application 'wkhtmltopdf', suggesting a lure for potentially unwanted applications.

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://pelibifir.ru/wix?keyword=namso+apk+download PDF link annotation
    • https://lasasokuvob.weebly.com/uploads/1/3/1/6/131607269/3625051.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/1769251.pdfIn PDF document text
    • https://davovexo.weebly.com/uploads/1/3/4/3/134355956/5023170.pdfIn PDF document text
    • http://card2card.live/cartoon_wars_blade_hack_mod_apk_free_downloadp8gtq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_5fe8eb709760a.pdfIn PDF document text
    • http://womenita.fun/simple_present_grammar_quizighgl.pdfIn PDF document text
    • http://yourbigdick.space/32199344211lxf6e.pdfIn PDF document text
    • https://vowodilob.weebly.com/uploads/1/3/4/6/134697463/f8d72ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393193/normal_5ffbf69ed6c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_6045feea5ba7d.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/xukirizugukugi/christmas_dress_down_day_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/27297629287.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/kinns_medical_assistant_study_guide_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/54840790688.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/debosimi.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/array_java_tutorial.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_off0000c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 5136 bytes
SHA-256: ed35c2b4db1e375ec8c1b0556020a3455b026ca178e82a970dd1a7f6fc0799ed
font_01_sfnt_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 10924 bytes
SHA-256: 0e9a39d6154ff01b88ff955576cdae1abb09f894e023778585e4afcca853d678

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