Malicious PDF — malware analysis report

Static analysis result for SHA-256 7391c8dc1bd4fa00…

MALICIOUS

PDF

76.6 KB Created: 2021-03-11 17:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb0fc48b6a6a0e02af2dcf0aa2d38e6c SHA-1: b55fea1a60e1ab27ed53d3ec8cdc28e3f2c0b622 SHA-256: 7391c8dc1bd4fa003302b45d4d290a8bf5e07dbb69d6ea483818331fee3c4854
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and one points to 'http://xebupiwemumak.rf.gd/traduire_un_texte_allemand_en_franais.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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://leonvi.ru/wix?keyword=the+actor%2527s+life+a+survival+guide+audiobook
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/975761.pdf
    • http://xuxuvojetuzutej.iblogger.org/brocade_fabric_os_web_tools_administration_guide.pdf
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/9212182.pdf
    • https://bigadamedoje.weebly.com/uploads/1/3/1/3/131384249/21d723.pdf
    • http://geteniruxoxure.22web.org/26606637682.pdf
    • https://nulowuze.weebly.com/uploads/1/3/4/6/134614321/bebewowalaze.pdf
    • https://bozelisu.weebly.com/uploads/1/3/2/6/132695328/ac6c68a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xebupiwemumak.rf.gd/traduire_un_texte_allemand_en_franais.pdf
    • http://xesesezaxemu.epizy.com/preview_introduction_to_computation_and_programming_using_python_second_edition.pdf
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_0cc44f813f0f48b5ab678077fa33d38f.pdf?index=true
    • http://xixomopez.epizy.com/49530342727.pdf
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_3df2b560c18e43d2a9f250dbebb0c88d.pdf?index=true
    • http://xenivut.epizy.com/apa_style_guide_blog.pdf
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_2a56dc47842649e9823e5e50a62bc020.pdf?index=true
    • http://rodowifesod.rf.gd/cambridge_pet_for_schools_exam_format.pdf
    • http://daparetefofan.epizy.com/51480299803.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_off0000ee3b.bin
8082e892a41df84c489b2aac0886e0ae4d3961c0c31329027cc7247d3d85ef82
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 5528 bytes
font_01_sfnt_off0001010f.bin
ee3b97dcbbb70b94f0c8acd036f8aafb68ea3a2629eac3bb3f5eb7c2ed7b8ddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 10592 bytes