Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dfc689b8c673a7…

MALICIOUS

PDF

74.0 KB Created: 2021-02-25 20:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4616d818ae04e9fef931dea63ac50ab9 SHA-1: cf8a2da3faa080e912a5349913a952f1173366b9 SHA-256: 23dfc689b8c673a7e55eb9fb52de3ee8ea320ce0dcb65c17d967504a0125094e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign content, but one prominent link to 'maypoin.ru' suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a link farm used to obscure malicious destinations or distribute further payloads.

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://maypoin.ru/award?keyword=a+clash+of+kings+chapter+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491159/normal_602a1c2eb4a00.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/HNjajic/zifenogakumagi.pdfIn PDF document text
    • https://xivunububan.weebly.com/uploads/1/3/0/9/130969166/tuxipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5fd37cac8d15d.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/whgfN47/famemarerugud.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/EXji6he/banebenotokatugamuvakal.pdfIn PDF document text
    • https://cdn.sqhk.co/vuluzazogur/etytjiw/new_ringtones_and_wallpapers_free_download.pdfIn PDF document text
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/wenununalob.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/nufidibodudulad/44783702791.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/blended_2014_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/caravan_stories_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/vegevaro.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/papepitinomelopejidaru.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/email_signature_template_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/black_desert_mobile_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/birthday_background_images_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/nopoxezawa.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/7141996306.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/sizifunifunumunonabilogu.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_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 5584 bytes
SHA-256: 1b4e8a415e29fab8a13b5a8eba7a260c6186c5861ac785389ce98a3b0cdd43ef
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 9660 bytes
SHA-256: 232ef497c53e40148e0499a2b448e83a0fd8e89b30ae6a0d2b062a1a27cece7f

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