Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecb98773ef7e19d…

MALICIOUS

PDF

72.0 KB Created: 2021-03-04 05:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 99d39cb36e7118d28a7ec3825b168a40 SHA-1: 14ed44eda6e064a341e433702a97366169d4dce9 SHA-256: 4ecb98773ef7e19d60f0fcbf8d13953446965a592775b8c10fcbc6e54526e653
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=how+does+facebook+portal+mini+work PDF link annotation
    • http://amaryllis.space/venusawelimixupanuvojbn.pdfIn PDF document text
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/08a4ff7e4de9a4d.pdfIn PDF document text
    • https://zamizugupaf.weebly.com/uploads/1/3/3/9/133999186/641f267383111c.pdfIn PDF document text
    • https://fipubizibogu.weebly.com/uploads/1/3/0/7/130775584/panadapope_texunufile_kapasis.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/livivuvuwugeb/16257618115.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/kundli_pro_64_bit_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/answer_phone_number_for_virgin_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/lifariguzoduzu.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/nimekibizugof.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/parquet_file_format_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/47037605049.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/amc_8_achievement_roll_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/brene_brown_empathy_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/mabozit.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/ms_word_fax_cover_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/66778025037.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/egyptian_cotton_sheets_canada.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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 5560 bytes
SHA-256: cda43250d6438d22c2812a86a58f399fabf8e360f42057d7500f1e9262286ace
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 10236 bytes
SHA-256: 452d0d4e99f4db365b0fbf20d188d9d21852108fac377e9a2d093f22a7b8d4e9

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