Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bccb20c43abdc54…

MALICIOUS

PDF

72.7 KB Created: 2021-02-13 21:28:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: c3ae10e90f382564e67177dabdfec023 SHA-1: 9e2ed99850e5cf9de5c06f96b96020b8e2620146 SHA-256: 4bccb20c43abdc541b577a8dcaf41066d4629ab9f55c598e619a72c0aa9ed36f
212 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/wix?keyword=real+steel+apk+download+hack PDF link annotation
    • https://cdn.sqhk.co/bewewojiwo/3lpjANH/gelasizugip.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/hgV19gc/koxupotagajaxajuxun.pdfIn PDF document text
    • https://nasipowo.weebly.com/uploads/1/3/1/3/131383467/muwemojosal.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/5jds8gh/7307803631.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/jiGvNgi/89005934759.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/luramamelolem/vemoxofif.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/11030649587.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/82696679403.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/azhar_all_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/romurewarami.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/vowogebekevulit.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/difference_between_thematic_analysis_and_template_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/lawasubigubakit.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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 5228 bytes
SHA-256: 2b67f1b50d2889b2632bd3b05d805b1f8661ff095bf0b06e8b879887b67e14ff
font_01_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 10184 bytes
SHA-256: 21c15381b634a3158d4af4dc12d50934925ae7ff83cc37a43ec1a27cabb60260

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