Malicious PDF — malware analysis report

Static analysis result for SHA-256 68486d8b6fd3cbeb…

MALICIOUS

PDF

75.6 KB Created: 2021-02-20 03:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 479e5109e47d9d36d6562acd2bed92b3 SHA-1: 4e6e88bc233ae4d00733da6a85a1bdc136e322b9 SHA-256: 68486d8b6fd3cbeb4c99a042fe02ded57ebf51199746e1af2d5236ae9db86390
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating it is designed to host numerous external links. The primary malicious URL, https://maypoin.ru/strik, is presented in the document body disguised as information about a portable air conditioner. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://maypoin.ru/strik?utm_term=how+to+use+delonghi+portable+air+conditioner PDF link annotation
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/gamaled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_602bea5200365.pdfIn PDF document text
    • http://babbieshop.ru/aankhon_ki_gustakhiyan_video_song_pagalworld4ntzd.pdfIn PDF document text
    • https://bukowimulo.weebly.com/uploads/1/3/1/4/131407836/ditod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_602dab102fd64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_60144773ad668.pdfIn PDF document text
    • https://jabizujosewej.weebly.com/uploads/1/3/4/5/134584717/9506884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496151/normal_601a02d28975c.pdfIn PDF document text
    • http://worldthailand.fun/after_effects_templates_logo_reveal2t4fq.pdfIn PDF document text
    • https://zogopovedizojux.weebly.com/uploads/1/3/1/4/131408172/xovujuvuxo-womosab-dozuzolenelaka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/seriposuj/hunters_hill_high_school_uniform.pdfIn PDF document text
    • http://dokedajonanumi.rf.gd/korean_children_s_books_free.pdfIn PDF document text
    • http://valamujunitun.epizy.com/48753616824.pdfIn PDF document text
    • http://kewugozosefo.epizy.com/xenaregumupoved.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/mofoxabozobilisafajubuk.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/9694242135.pdfIn PDF document text
    • http://zekumom.epizy.com/work_breakdown_structure_template_software_development.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/62956388778.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/boston_weekend_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/dengue_in_pregnancy_acog_guidelines.pdfIn PDF document text
    • http://fefomuk.epizy.com/tujiwadikotirivatuz.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/kuvijanejejowedovo.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_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 5528 bytes
SHA-256: ad2094576f53de2580084f163c6947fd8a97294983cbc4e8e44f9d175b0faf8d
font_01_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 10776 bytes
SHA-256: 52627147650e4c4760aabcb23b64b72f0f8c72bc6080717e964fd3cc7f47bd8c

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