Malicious PDF — malware analysis report

Static analysis result for SHA-256 e292aece83f32939…

MALICIOUS

PDF

79.5 KB Created: 2021-05-25 01:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 02880200b6b0b127ab3e9e53615b8cbb SHA-1: 1b2278944a0333c61deaffee840d6f1ac620819a SHA-256: e292aece83f3293980ffdc27f2d31c5cd455458f523f0049eb219670f1979205
156 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 0.9998

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 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.
  • 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://pelibifir.ru/strik?utm_term=singapore+primary+mathematics+3a+workbook+pdf PDF link annotation
    • https://lulaxakopoto.weebly.com/uploads/1/3/4/3/134331182/24e9de5a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_6044980860a12.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/xemubumulan_rarinaj_gasuwawesude.pdfIn PDF document text
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/f715c95c773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457272/normal_5febb0ec2a856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_601f5c4cc456a.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/buwosevax/52494865465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82f354a-c392-4c39-9e21-423ffb56371d/peg_perego_prima_pappa_best_high_chair_replacement_straps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd0d290-6981-44b3-8d87-7aa261eec811/zeladefutazojobulaput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54af683b-4884-4008-b239-edc8e755c6b6/skyrim_guide_direct_download_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/zojirubovafalonewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f0d77f-2c17-4cb8-8710-3470ff2a88c4/40395114014.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/photoshop_cc_shortcut_brush_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985cf12a-7151-4c4d-8e3d-236d4e19dc83/jijurigez.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/craftsman_25cc_weed_eater_carb_adjustment_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/fizug.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/14888310785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b21479-0536-45ce-a04e-5489b07bb2b2/ti-84_plus_graphing_calculator_for_dummies_download.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_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 6200 bytes
SHA-256: ffb4c20c780d4eb832aa8bab7193c2b9f0cc554814a088ad8a846e4247bc7d2a
font_01_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 11064 bytes
SHA-256: 9f8d88e799b98dc5381667b0a2335b608a783adeee8b01b8af1b40e566a71aa9

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