Malicious PDF — malware analysis report

Static analysis result for SHA-256 528d5259b07045eb…

MALICIOUS

PDF

68.0 KB Created: 2020-12-16 04:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3e327cddf0c14928b0ff15291e66da1f SHA-1: 1f214825a6d52cb1b9b6b1c65997ff09a66fa373 SHA-256: 528d5259b07045eb736abe63e66a473e79957802383d7db26fde3624fad42e03
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://ggtraff.ru/123?utm_term=gymnastics+code+of+points+uneven+bars In PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_5fadd6da16cf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_5fd144bb029cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450727/normal_5fa45e1cb21e7.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/3782030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_5fb6b07823f04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_5fbb5f1c39aa4.pdfIn PDF document text
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/268137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fbbe8e6992b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd148532780c533aaa78ae/1606227078939/8990091384.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6c0f08651a04751934446/t/5fcef845cd9a2056ff6b7e46/1607399496790/dilibunotofu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4deb088c99b6d37c0af76/t/5fd64c0dab1a676c728ae7b9/1607879696743/62736925490.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/darth_vader_ps4_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/75105818468.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5919de2fce462bcaba119/t/5fcaf7821415195da07cc02f/1607137155855/fufumibefis.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/60103301120.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_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 5600 bytes
SHA-256: fb9c34336226a986e6f586a22140361d8f5d7ece9b7dd6a2724acd49041965b5
font_01_sfnt_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 10476 bytes
SHA-256: cb86f28c3b1efaf04e820756f165745ae4acc040671fc58cded941d1bab59526

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