Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b81f56df1d2e69…

MALICIOUS

PDF

85.6 KB Created: 2021-03-24 14:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a901e0bb1fa9b9e4c8c43facfe542f0b SHA-1: 90bcdee449e0088c2d8f313fbdeebb1f452bc9cc SHA-256: 05b81f56df1d2e694cc1404f9a06879ecbe7b956348e082203bacd3fc34ccb79
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=indemnity+breach+of+contract+difference
    • http://menedowu.iblogger.org/arcsoft_totalmedia_3._5_license_key_free.pdf
    • https://vufobuvi.weebly.com/uploads/1/3/1/1/131163959/tavidijimotuf.pdf
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5ff61617bfa04.pdf
    • https://static.s123-cdn-static.com/uploads/4502500/normal_5ff88731bfe5e.pdf
    • http://tijukilebag.getenjoyment.net/fapixij.pdf
    • https://juzofejojakowam.weebly.com/uploads/1/3/4/1/134131318/738e67ca48.pdf
    • https://sigudadu.weebly.com/uploads/1/3/4/5/134513773/a1a7284.pdf
    • http://texivej.sportsontheweb.net/gavesuxejabiwarakutisuri.pdf
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5fcabc2f9c576.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d1b62ac4-4bbe-4ddc-82a4-e994c1485cf5/what_grade_level_is_dork_diaries_series.pdf
    • http://xakafof.rf.gd/can_divorce_lawyer_subpoena_bank_records.pdf
    • http://fawofalolujug.epizy.com/actiontec_c2000a_firmware.pdf
    • https://uploads.strikinglycdn.com/files/3294c416-0d20-4a38-843a-2dd5a2827b32/44563206570.pdf
    • http://gunexukod.epizy.com/alone_dp_image.pdf
    • https://uploads.strikinglycdn.com/files/3cb18ebe-13bb-4fdb-92e8-209c4f798cd3/64378158692.pdf
    • https://uploads.strikinglycdn.com/files/f88849ba-f880-4394-8f65-518923b39a71/software_developer_jobs_in_canada_salary.pdf
    • http://fitunugiwa.rf.gd/wepoxixuzuzurafawupupeki.pdf
    • https://uploads.strikinglycdn.com/files/13dd96a7-0108-44da-b37c-cabe34bd3077/how_many_carbs_in_a_krispy_kreme_blueberry_donut.pdf
    • http://koxowideza.epizy.com/bangladesh_vs_afghanistan_highlights.pdf
    • 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_off00011227.bin
31659023a5ccd9e42316bdcc841457eb2ba8f4781940b3fe9322ddbae69f10d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 5228 bytes
font_01_sfnt_off000123cd.bin
f5e4ac66d4ca54eb8b1d4992075e0a49abadad02c42b740090f4752c34ac46d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 10944 bytes

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