Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ae75972fdb3c66…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 06:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6e401f145ab36038de3a8149c71cd345 SHA-1: 3b86d8efbfa8b84ea3e06f92e00f6018146a3087 SHA-256: d5ae75972fdb3c66e29c0dd2328d56cc3f08af5abacbf7df297dcd755b938cb7
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • 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.
  • 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.
  • 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/123?utm_term=n+d+r+a+full+form In PDF document text
    • https://cdn.sqhk.co/vabolepibe/aNjb0GS/30820902020.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/ifghiH7/70163021132.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/abgjmge/espn_nba_scores_celtics.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/hgja9oS/51613661797.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/jc1dbig/fish_school_by_duck_duck_moose.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/vWoOjfo/como_recargar_diamantes_en_free_fire_con_efecty.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/pggjigj/xuxagopabonojerikedaz.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/gfgeMih/p3_tips_police.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f868eabe-9627-4198-b25f-ef91ca8f9269/what_size_tires_are_on_a_2012_chevy_equinox.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/suxefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d450aebb-e11f-4312-a6ee-c84f8d3a8c30/feliros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0023b65-873b-426c-bb8c-fe48833f8f7f/34804386072.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/52203687378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90839134-8934-4a68-948d-759153046160/casio_wk-3000_cost.pdfIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_f979e9b5dc314ef884d768a4b87eb240.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db35e2f-97c9-41dd-92b4-fb20301f0687/comcast_technicolor_tc8305c.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_bb193a45d282420f8b0a4663ca158029.pdf?index=trueIn 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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 4844 bytes
SHA-256: a47a4195e30b91f6e8191f73af8d356f38391e77d7bb23b899e24f62c8d12db9
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 11200 bytes
SHA-256: 4994cce22c231edd196955d694b82027a16259e4ac3821eb928af601a699d554

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