Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1015975bbd27b99…

MALICIOUS

PDF

72.0 KB Created: 2021-02-17 16:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d91bad80e1834a548caeb123aa148bfe SHA-1: cb7dce43d5f02767bee4ed7d583104f455918c94 SHA-256: b1015975bbd27b9902afb851da67abedfd7e43c5005ce9f959dca5011d8212bc
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=why+are+my+beats+solo+3+not+connecting PDF link annotation
    • http://wide-take.top/91929989556yq2zk.pdfIn PDF document text
    • http://lodixewovufosa.iblogger.org/sotafakepexenavel.pdfIn PDF document text
    • http://zasoremejoka.iblogger.org/rockstar_full_movie_300mb_free_filmywap.pdfIn PDF document text
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/fobagasa.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/votawawo/frequency_table_and_bar_graph_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/89991374246.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/comma_splice_worksheet_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/nd_bhatt_engineering_drawing_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/91658059935.pdfIn PDF document text
    • http://zezewesiwakoruw.rf.gd/pidiboxoguwexanafe.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/wisom.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/51830875516.pdfIn PDF document text
    • http://woxebolinos.rf.gd/bouquet_of_red_roses_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/kekapazujevawivosadejefu.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_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 5632 bytes
SHA-256: 516dbda5acd71bad8bdf2fcec31177547f9f756058a1e1cebe185ededb58cad5
font_01_sfnt_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 11448 bytes
SHA-256: 877c3be02516e94c15721bbee0101942d08f6a68c16ad35208f73aee0449d572

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