Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4bec4423a654e3…

MALICIOUS

PDF

81.4 KB Created: 2021-04-01 19:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a39315ffbd6c3ad0f079ad2d38325000 SHA-1: 79a6926a18b132da816d4617dd1fdae37439b88c SHA-256: fc4bec4423a654e33574ae7ce61f2c81760be29fcf6cd6d81d0866ab330406d5
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm and an SEO redirector pointing to 'https://baarspo.ru/wix?keyword=the+party+at+kitty+and+stud%2527s+parents+guide', suggesting a phishing or content-luring attack. The PDF also includes numerous external links, some of which are benign, but the primary malicious link is prominent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=the+party+at+kitty+and+stud%2527s+parents+guide PDF link annotation
    • http://becloud.website/wishes_fulfilled_meditationqeref.pdfIn PDF document text
    • http://trysoda.pro/62371374844rqlcm.pdfIn PDF document text
    • http://fikipasofesopem.22web.org/74990406511.pdfIn PDF document text
    • https://jodotabamusunew.weebly.com/uploads/1/3/4/4/134402052/vipirenis-radoj.pdfIn PDF document text
    • https://pasetesosetoje.weebly.com/uploads/1/3/0/7/130775590/abe65b4.pdfIn PDF document text
    • http://topcreditreport.info/pibotilazasipop3tl81.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/neporezofov/bass_fishing_reports_lake_guntersville_alabama.pdfIn PDF document text
    • http://mawabubobiniz.rf.gd/how_to_analyse_quantitative_data.pdfIn PDF document text
    • http://bukufam.epizy.com/calories_in_arbys_gyro.pdfIn PDF document text
    • http://falogivaxaf.epizy.com/powerpoint_template_free_pptx.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/business_card_template_illustrator_vistaprint.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/egyptian_museum_cairo_guide_book.pdfIn PDF document text
    • http://bojiwivepexa.epizy.com/how_do_i_put_galaxy_buds_in_pairing_mode.pdfIn PDF document text
    • http://sidajewaset.epizy.com/butlins_skegness_map.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/18171204095.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_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 5340 bytes
SHA-256: e00e6c8b393ba06ec4edd902bc6477e5ad2e103b3e1d39823c30aaa52a7165f1
font_01_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 11596 bytes
SHA-256: 12e23a74af0f0929c5af3fa1091495e74fc3a911a6c005652cbaf019a24e36b3

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