Malicious PDF — malware analysis report

Static analysis result for SHA-256 5266eb1e2632c164…

MALICIOUS

PDF

80.8 KB Created: 2021-03-24 03:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 629cf588e4e0df61b7879a011a03eff0 SHA-1: 8d7a09838af6897f883ea9076e06abf3b343a86d SHA-256: 5266eb1e2632c164850996107408e5a6f33d667dc3fed75a7284a9c777dd34a6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, including one to 'soxebez.ru', which is likely part of a link farm or phishing campaign. The document body, though heavily obfuscated, suggests a lure related to educational content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=central+inscribed+and+circumscribed+angles+worksheet
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5fc73161c8ae8.pdf
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/viganim.pdf
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/wekilunulemetu-mapumonoge-narufaxug.pdf
    • https://static.s123-cdn-static.com/uploads/4470029/normal_6000adab81ecb.pdf
    • https://rotisozag.weebly.com/uploads/1/3/4/6/134679288/wupoxozedovitid_xijoxanurus_laferefetu.pdf
    • https://suzuxagutif.weebly.com/uploads/1/3/4/3/134352905/xotonoxoniwevomewod.pdf
    • https://dexowexuwix.weebly.com/uploads/1/3/0/7/130739316/vorizirutumanel_fokugegiwo_jidizekinujoj.pdf
    • https://kupezomevul.weebly.com/uploads/1/3/1/1/131164546/5497580.pdf
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/rezexiliwakew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mizujem.epizy.com/54641485728.pdf
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_1e2297ceedb548279e34b48b82c1fe9f.pdf?index=true
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_3fc86c4544624f5198fa4f3742cb2b4c.pdf?index=true
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_c3e5a5e23bee413b9ad5f37b9e0d49fc.pdf?index=true
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_2badbc470e0e41c18a21f7587451bacf.pdf?index=true
    • http://kolofagigetu.epizy.com/valimofebud.pdf
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_bbd8e81fc20c4400a426c3e36b36e53e.pdf?index=true
    • http://devofemosek.rf.gd/about_foundation.pdf
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_d6d0afb9869a4f4a8793dc18ed46bf1d.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_off0000fba4.bin
308ef4bbd979325db162ef04618c6961d7066d7af69c266478b13082cb5f92af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 5552 bytes
font_01_sfnt_off00010e62.bin
ac90bdd70f120576763dff259cb5466755f21f873cea762064f3971226b92529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 11480 bytes

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