Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a2379af7351174…

MALICIOUS

PDF

80.2 KB Created: 2021-02-15 15:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: eb1f57573823d424bc0074094aa8ede6 SHA-1: 5b5bbb2dbd94df925ba6bbb56d06280b258c7f89 SHA-256: 72a2379af7351174c6b05fa65d314f9b899d2d45e6a3e47e1133a6262f4b47e6
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=volume+word+problems+worksheets+with+answers PDF link annotation
    • http://qlemelest.online/excursiones_de_cruceros_el_corte_inglesd7od1.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/dgcjflt/36404201614.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/iiHjcha/samsung_video_library_apk_android_7._0.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/i7i1jht/nhl_playoffs_2020_bracket_picture.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485807/normal_5ffbf87367d80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5fe4355592683.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/WKA1oJR/roof_it_right_orange_park_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_5fd8dd8206343.pdfIn PDF document text
    • https://bovopoboj.weebly.com/uploads/1/3/0/7/130776351/884971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5ff9a7edbff8e.pdfIn PDF document text
    • https://kujadivenudeku.weebly.com/uploads/1/3/5/3/135324903/perit.pdfIn PDF document text
    • https://xepawonim.weebly.com/uploads/1/3/0/7/130776577/5ba49.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/bbb63f8.pdfIn PDF document text
    • https://betozuwozoz.weebly.com/uploads/1/3/4/1/134108580/8287205.pdfIn PDF document text
    • http://vizit.store/78393593449q99h7.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/ht0iaig/depumokim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mejifavo/math_101_vu.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/britannic_font_family.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 5344 bytes
SHA-256: 20b4f9190393a536c554a4ffcb0de07ad57c90d4ad056111036c9123ba60a41c
font_01_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 11032 bytes
SHA-256: 2bd1bf4c47280a7713a7fb618daa8ed4f828e9c25e192cb3a8fb2b2cdb0b95c1
font_02_sfnt_off0001103d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 16076 bytes
SHA-256: c33faafd911d2c4e8fea0807a017527063dea1be9a25b30e85ccf6f7667e82b6
font_03_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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