Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ae2ada9950a160…

MALICIOUS

PDF

155.5 KB Created: 2021-04-02 20:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2ad59a2b23f281af0cc45e1022f46a41 SHA-1: e9020938d5088441d86a5f27065f4c316af7349a SHA-256: 51ae2ada9950a1606c42233451b2ba182417957ba84b2daa40dc53692372ff31
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to reference 'Knoll inc annual report' and 'wkhtmltopdf', suggesting a lure to disguise malicious links. The presence of embedded URLs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jottigo.ru/123?utm_term=knoll+inc+annual+report PDF link annotation
    • http://tedalaz.66ghz.com/how_to_delete_template_in_iauditor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5fd7cac0bf639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388279/normal_5fded8b0c5122.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/ego_lawn_mower_battery_winter_storage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_60136a362734b.pdfIn PDF document text
    • http://runivofo.iblogger.org/drunvalo_melchizedek_flower_of_life_volume_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_605c4b9fca68b.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/sazasalesidomagipe.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/negebanofaliximo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xepatodop.onlinewebshop.net/ataxic_hemiparesis.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_8cf8d831e6f04791b10b3285788c14de.pdf?index=trueIn PDF document text
    • http://pujumek.myartsonline.com/47347295143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda39049-17ea-490e-bca3-4b761c066e67/rometutulawipufomujedoda.pdfIn PDF document text
    • https://30bb9d03-04f1-4043-8ca4-b11f08dd7d37.filesusr.com/ugd/82ab19_c27faab8199747d887b7b7a9786c9df6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6868aa3-b9ef-4a04-8032-1e224dbb999b/yard_machines_lawn_mower_gas_tank.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_off00022b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B34 4716 bytes
SHA-256: ceadc94ecf4ef96a2c9519fcacbe32f5115324170eb78b16308d4ee928a434f7
font_01_sfnt_off00023b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B53 10848 bytes
SHA-256: 970ab45db0bdb5c13cc99c1bcd18d6b5c2bdc66d1ff19085d7a3d2b30fff7651

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