Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff8ab7d0d3c7481…

MALICIOUS

PDF

91.6 KB Created: 2021-03-13 20:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cd9b78027a792bc1aa06790df306c2f4 SHA-1: b063fb1cd2b52ee73e7be19e9830203d8682b257 SHA-256: bff8ab7d0d3c748198599248fc1631f8bb2f34a9afe8f849a806f8e28d93984b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=webassign+answers+calculus+1+1.+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473432/normal_5fe6de388dc16.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/jaybird_x3_not_pairing_with_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410206/normal_60071b97e33f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465151/normal_5fcf2c01dd1f9.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/truth_in_comedy_epub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_5fe82eeb54a2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5feb42784209b.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/online_quran_text_with_urdu_translation.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/dnd_unearthed_arcana_artificer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_60388c463ae49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489259/normal_5ff540bf1eda4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_5fd62fc8bdabe.pdfIn PDF document text
    • http://dowotezovemalo.mygamesonline.org/lotiso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_6022bd533798c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_85da6f5d31994494ba75cbae45fcecc1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/32906602605.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/femadajegejijot.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_b5ab80a4c8724847aa6dbae91e3f4c79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujodibu/fewul.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/4537872240.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/40906839986.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 5460 bytes
SHA-256: 05b8ef59f1f9154679e998d0eca9ceb225c5c7983daa4216b09d211fc7b41ea1
font_01_sfnt_off0001395a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395A 11664 bytes
SHA-256: ba616df8a9bc3e769f660c61bf71c82b69b349cd7b1e5d4df17f53ee5bd84556

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