Malicious PDF — malware analysis report

Static analysis result for SHA-256 656f95612b16e7fb…

MALICIOUS

PDF

84.5 KB Created: 2021-02-11 23:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a263ca490dd25041ef5e3a614b07ffad SHA-1: e2035ddc1662fb98e27bf0e6fcb93d8ba6881acb SHA-256: 656f95612b16e7fb72ce9937bcb6c93a74c18f185b8a0312559545ce132c9b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic indicating it is part of a link farm, with numerous external links, one of which is identified as a potential phishing or malware distribution URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to song lyrics, likely a lure to disguise the malicious nature of the PDF.

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://maypoin.ru/wb?keyword=back%20bench%20student%20songs%20free%20%20320kbps PDF link annotation
    • http://healsmall.space/47359570572xa544.pdfIn PDF document text
    • http://kittyplay.online/jesimilonewixazjjh2.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/ajcgcjj/91081142526.pdfIn PDF document text
    • http://rrrrkkkkk.space/66282709421mp9o0.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/HntBGic/ufc_253_results_wiki.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/2441170.pdfIn PDF document text
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/1a0e6ba341bcf.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/goneduzum/riferofuwotulobinarevovup.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/android_phones_under_7000_and_features.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/jejokilegifawu.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/freedom_writers_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/89859365515.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/payment_order_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/business_model_canvas_format_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/devegasuxadoteweli.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/lavamevizelibad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 4668 bytes
SHA-256: 9ece090c3974318659d1378c9294f5e81ea21be4f4c6585a6d9c9375e0d78737
font_01_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 6076 bytes
SHA-256: 99566598cf5f390dbdf66e873e1d22dc232826b0171238a6434e757ab03a8a36
font_02_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 11104 bytes
SHA-256: 570bcd63f02452da6fa5bb0a471a272e0daf37711085309a99534e59169b8f45

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