Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63269bb6d584b83…

MALICIOUS

PDF

75.1 KB Created: 2021-03-06 07:13:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 024be5b5f6d4762da61a3bad251a4718 SHA-1: f2809076d36a50ad82bcc3dcecf2e794d40f97e3 SHA-256: c63269bb6d584b83aeff64359a501306d71b58ad22a274f16744952ec93f54a2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/strik?utm_term=roomba+530+battery+reset PDF link annotation
    • https://cdn.sqhk.co/vunebapenuj/gfZr7gc/craft_seamless_3d_arm_warmers.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/Ziajfif/4426349574.pdfIn PDF document text
    • http://nokobefisedo.iblogger.org/bigufozofamitakaxejikaz.pdfIn PDF document text
    • https://manasuma.weebly.com/uploads/1/3/0/8/130873954/rebegaxekalex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5fd62a2508c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_603b0bc26ef82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470526/normal_5fc988a6b5ab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_5fd95c5e68e6f.pdfIn PDF document text
    • https://gadevonetikob.weebly.com/uploads/1/3/4/3/134358307/7101705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niworojuxine.rf.gd/63933882333.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/platform_toolset_v120_not_found.pdfIn PDF document text
    • http://nofaramubibuv.epizy.com/59864990721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9ea3db-7ac9-4dd9-a4d8-656f59dd6e0f/wh_questions_worksheets_for_5th_grade.pdfIn PDF document text
    • http://jelolit.epizy.com/29696160081.pdfIn PDF document text
    • http://zululofigitesep.epizy.com/85257168739.pdfIn PDF document text
    • http://resisojopemolo.epizy.com/how_to_begin_screenwriting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/907f4961-950c-4295-bba7-cccf5ae7e9c5/dungeon_master_tools_conan_exiles.pdfIn PDF document text
    • http://bisavosimirot.rf.gd/paper_rose_leaf_template.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 5476 bytes
SHA-256: f819e789bd9c5b878a7f249ecc361f91ade5d01a2eff023f5c43e38fea0d2ded
font_01_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 10376 bytes
SHA-256: c66308b182e2c121d2c948914124b1aeb0ede53a1ca6208a164678a211bc0a7d

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