Malicious PDF — malware analysis report

Static analysis result for SHA-256 040dcbc148e88458…

MALICIOUS

PDF

69.2 KB Created: 2021-03-23 09:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ad643875a228da68003094157efba1fe SHA-1: 626ff609f155c2158f8abde33e563fc5340c94f8 SHA-256: 040dcbc148e88458bdb3931796b014a7bf4582038ee704fc676b32943e735134
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a significant heuristic indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a theme related to data analysis, likely a pretext to disguise the malicious intent of directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=analyzing+numerical+data+estimating+large+numbers+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5fe6c7b9828a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5fefc61e8a701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_60164db6322bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_5fe6fb618112f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489599/normal_60513a191218f.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/fuporodosoguribanabinon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_6049ea9434066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451766/normal_5fe6d9a59b813.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufavikog.epizy.com/needs_assessment_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9e111a-c59b-411d-8523-2af942c399cb/waforuramavalazizozuguja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa31ef9-c016-4904-99ef-0b6d3050d61e/37982527813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dafd3037-fcf7-49bd-8a3f-a8d318a21e4d/pajosewikumuvuzoxisade.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/dj_lyta_dancehall_mix_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/sinawumazivir.pdfIn PDF document text
    • http://rajemezipuz.rf.gd/tipos_de_sistemas_operativos_de_celulares.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/finebujoxolodir.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/chinese_wedding_invitation_wording_template.pdfIn PDF document text
    • http://jeximejepexifog.epizy.com/42134254232.pdfIn PDF document text
    • http://gowejolu.rf.gd/goxusosobalomokijoziraj.pdfIn PDF document text
    • http://dilutibu.onlinewebshop.net/understanding_pathophysiology_free.pdfIn PDF document text
    • http://risewoririti.epizy.com/7795004983.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_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 5696 bytes
SHA-256: 0486e2561e3a9ebff7acffca0d69bf8630d70b0850012db490d21ceab7b8e2f5
font_01_sfnt_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 10312 bytes
SHA-256: 286ebdcd97819ec820b1bcd1e2962f53a57dbb679f12430d1535fabebfe3b2d3

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