Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d10b80306975e31…

MALICIOUS

PDF

81.4 KB Created: 2021-02-19 22:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5c541b5d77fd7f1ca44538ecfdaa055f SHA-1: e4f48cf1e5d8128074acfd7ed6ee6a7b521d6b01 SHA-256: 6d10b80306975e314f5e352756f75beede2778fa9edb65d7d9f1ac2c23b4b41c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+write+a+proof+for+congruent+triangles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446026/normal_60300a1346cd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471234/normal_5ff3c0aab8a40.pdfIn PDF document text
    • https://golujubomo.weebly.com/uploads/1/3/4/0/134017735/gifogatomuzosu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445866/normal_60013d4b1a9cb.pdfIn PDF document text
    • https://ketijumorowifop.weebly.com/uploads/1/3/2/6/132682879/434cd6a238780.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/6174891.pdfIn PDF document text
    • https://zigudufojivop.weebly.com/uploads/1/3/4/7/134718002/4797923.pdfIn PDF document text
    • https://gitumakiwu.weebly.com/uploads/1/3/1/4/131437138/farakofemaka.pdfIn PDF document text
    • https://kobenavu.weebly.com/uploads/1/3/4/7/134714827/moxunemiz-jofabivat.pdfIn PDF document text
    • https://nugibunexediga.weebly.com/uploads/1/3/0/7/130740514/jewum_gujimabuta_xupepebesowiv_tolapaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_60258b58d20f6.pdfIn PDF document text
    • https://cdn.sqhk.co/nugunexinazo/hqhiM1f/juregexosegojadudujosoz.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/dowesitobuga/transformers_optimus_prime_studio_series_38.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/goxizorawit.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/jinja_template_python_if.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/one_clue_crossword_answers_chapter_43.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/nenezopojizu.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/90704792647.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_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 5236 bytes
SHA-256: f1bff5df8decc0f93391e1ff4bfe276058e904c51e25f79215303e48b66c84ad
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 11272 bytes
SHA-256: 5887d1dff153defbaed582a8dab2d9e703813212259794355ca8ea03e2991e9f
font_02_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 16256 bytes
SHA-256: a37bafcc1ea02316a8233b3be00b1109ff109a4a6e2d901b42fe741ebc039ee3

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