Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe372fecc3b4ea4…

MALICIOUS

PDF

77.6 KB Created: 2021-03-14 03:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 08decd2e56d520b4c32ed067d77b0a27 SHA-1: 51f90de9021af57789075f39b9c23331852fa269 SHA-256: bbe372fecc3b4ea4afcd1f6f3e51775b78862eeed14b9d4b5da9c71222ea4313
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 0.9995

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.
  • 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://xajibur.ru/award?keyword=search+pdf+books+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369664/normal_5ff2699b5f08b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_602cd67d1f681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473445/normal_6047ab98b242b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_601105501691c.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/lafemogidelotafogizib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475999/normal_5fcc5c7080c85.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/gre_quantitative_comparison_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_601f6b93b50f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_600c3580a98a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426682/normal_60419d27408e8.pdfIn PDF document text
    • https://ragojozuzaz.weebly.com/uploads/1/3/4/6/134668900/8f1283e4eb402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_604d66a8c080a.pdfIn PDF document text
    • https://jeboxalu.weebly.com/uploads/1/3/0/9/130969965/wupurorodovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_60108a2231ff8.pdfIn PDF document text
    • https://sutopudebesi.weebly.com/uploads/1/3/1/4/131438093/2039043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481422/normal_5fcf2aa9135dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451766/normal_603f5a172c190.pdfIn PDF document text
    • http://xeberok.getenjoyment.net/verset_biblique_d_encouragement_deuil.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/sivulanuzudagukinuwo.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/unity_asset_store_sale_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_d1bf386228d045c0b766c5c963d5e442.pdf?index=trueIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_4447a30adc924955b756e551412e7b2c.pdf?index=trueIn 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_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 5644 bytes
SHA-256: c1f08795bbdb717d6e96302b9a79f8edde60963f93e37abed63b90c0fc8a769b
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 11156 bytes
SHA-256: ca9531990120a49bfbf355d2d816e8cb6b4a34c4f4b31732446d03dc82e4add6

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