Malicious PDF — malware analysis report

Static analysis result for SHA-256 70509ddb0488b1c5…

MALICIOUS

PDF

76.6 KB Created: 2021-01-31 23:33:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 20d036610466c96289694df8f7166456 SHA-1: e66a63b5637223da6bb24834728cef04b9564fae SHA-256: 70509ddb0488b1c5799c1eafedcfc440de691e1a41dab22b9d422abb931cf65b
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=free+instagram+story+templates+photoshop In PDF document text
    • https://static.s123-cdn-static.com/uploads/4452621/normal_5ffa05349c9b5.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/jhjieHr/55282011554.pdfIn PDF document text
    • http://plusstore.pro/psiphon_pro_unlimited_speed_apkpureuqqh3.pdfIn PDF document text
    • http://reweder.site/tai_chi_fighting_techniquesk2k5y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470391/normal_5fec2aaa2e8ac.pdfIn PDF document text
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/8375712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_5fd246044158a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416798/normal_5ff758798b7b7.pdfIn PDF document text
    • http://mmamba.ru/unseen_comprehension_worksheets_for_grade_3n8e6k.pdfIn PDF document text
    • http://cancandance.org/pilonenexatixazepe4hrgd.pdfIn PDF document text
    • http://begetus11ppz.xyz/land_law_2_notes6dqrx.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/tofizo/ballade_pour_adeline_spartito_pianoforte.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/determinant_of_2x2_matrix_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/line_graph_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/40268767969.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_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 5288 bytes
SHA-256: 640187e1d266c02f9f8a246b6cb85b9fdf59cdee22921d3e59bc8a9852874c56
font_01_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 11136 bytes
SHA-256: 4f8067ae40f73860aa544f8c0dc5751ce91d01b8aeb96ea999882ae47dda35fb

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