Malicious PDF — malware analysis report

Static analysis result for SHA-256 db45eb81192d6568…

MALICIOUS

PDF

75.2 KB Created: 2021-03-17 19:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fdd01cba3e9293d32274ef1d1938abe SHA-1: 7440b3b16195a83d7eab7d92ce9a434d9a819612 SHA-256: db45eb81192d65689aad93ff592ed264524793fa7bcc789b08f0c4157238ca69
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URIs and the overall structure suggest the document is designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=amoxicilina+500+bula+pdf
    • http://subanufuxazis.iblogger.org/38490945330.pdf
    • http://jepumir.22web.org/mekuga.pdf
    • http://xufopizaxeto.medianewsonline.com/6814394143.pdf
    • http://sevowina.medianewsonline.com/86756853101.pdf
    • http://mumolazesinidix.getenjoyment.net/nutiwodutakoxizoluzu.pdf
    • https://noverike.weebly.com/uploads/1/3/4/3/134349253/lubeboxinepebevegak.pdf
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/1789122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f3e0ee59-b309-4736-aefa-1db4f942b0be.filesusr.com/ugd/e87662_550683dd296449cfbc2485648816d7c7.pdf?index=true
    • https://s3.amazonaws.com/pogolo/nature_background_hd_pictures.pdf
    • https://s3.amazonaws.com/vavejijitatofu/ixl_free_math_worksheets.pdf
    • http://vebagakid.onlinewebshop.net/nicholas_sparks_latest_books_2018.pdf
    • https://s3.amazonaws.com/xesigeze/85780107747.pdf
    • https://s3.amazonaws.com/boxalewijim/49414579058.pdf
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_721aeef1102b44848fb8be1af03a887f.pdf?index=true
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_b8cc4b6301cb4fd981977feaa2d1a7f2.pdf?index=true
    • https://s3.amazonaws.com/kufazete/73747210574.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/pronoun_and_antecedent_worksheets_6th_grade.pdf
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_9742b36ad6d94643a1cca0ee76c27cc0.pdf?index=true
    • https://s3.amazonaws.com/ratixifo/832986709.pdf
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_4db41ea4a92a485bbf70e9971aabdc2d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54f.bin
06f84b7847c3d0815d233136c7cf38d3e8b31c3e52275660fbde2b2841940bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 5488 bytes
font_01_sfnt_off0000f7f1.bin
3533c19b0d8b40272bfc4117fb97f25ec4919885924b4fb07e62ce3fcd2ba5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 11224 bytes

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