Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dde45e5e86c028e…

MALICIOUS

PDF

82.3 KB Created: 2021-04-18 00:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b5630378a5cac823f86d506b7c18632c SHA-1: 93bb97138b11a6ccbcad6a25baada42bb289e46f SHA-256: 2dde45e5e86c028e9f30d9945029873be334114336a52e7259ea6f9622c83a37
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 0.9996

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=call+of+cthulhu+edge+of+darkness+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387810/normal_606d4e7dcbb13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5ffcd97b0854e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5fdff241802da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481062/normal_6005e12400d16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_60624ac799455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fca689794e30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5ff9a7fcb94a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_6041d45fb45b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_602ed7df8ce59.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/dedinavesute/8954751073.pdfIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_3170ecfa31864c1c8b5bba072f5ed93d.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_d6436ffa61c74ebaba8e691e9d691fa6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/xmanager_passive_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7922de9c-c671-478f-944c-4b97a0075bf6/que_significa_ayuntamiento_en_la_biblia.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_dd303dd363f4435aa753f6a42e3b74db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorogamat/what_to_write_in_a_personal_statement_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/61380190958.pdfIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_c9574826a0bf4111ab28716621f0bfec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37331090-8d62-4aef-b713-bd6ce4149a00/83397727958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bddad6f-d91b-4372-a426-0bacfecbcd82/sekerozoxatuwezuvop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1bc747-f53b-43a7-94ae-675c0cfb867d/mechanical_engineering_colleges_in_new_york_city.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 5336 bytes
SHA-256: 2e9203a46c694d6c4163bfeeeda33076bf4dc917bb1bf7f3052116976b4922fc
font_01_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 10200 bytes
SHA-256: 3a13a39f11d6845191cbd78aa910a682a8b878e145cd936703bb377753232b9f
font_02_sfnt_off00012d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D48 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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