Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0b7d6acf34929b…

MALICIOUS

PDF

66.3 KB Created: 2021-02-24 17:12:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: caf3caabb7d3444612471f7ea76756e1 SHA-1: facbdad5af08de118fe3da794408c2158fc618f8 SHA-256: 5f0b7d6acf34929b40d9217039f1029095a66beaff761b5744c2378aecdb8e74
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The primary lure appears to be related to 'Kenmore air conditioner filter', directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=kenmore+air+conditioner+model+580+filter PDF link annotation
    • https://cdn.sqhk.co/rubupidorinu/ahdohfj/gym_flip_vip_mod_apk.pdfIn PDF document text
    • http://zupurowuzuxule.iblogger.org/plasmid_isolation_by_alkaline_lysis_method.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_6003c7e0f10e4.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/sic9jhf/cartoon_laughing_sound_effect_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/keragipiki/hgjqRje/xeridumenenirivokixakuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_602536e2d9199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_601edd1320c00.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/hd5zgfN/85124995193.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/BGsgfGD/bemarekejizudeji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445739/normal_5fc6838731ecf.pdfIn PDF document text
    • http://slamelina.website/majafidavakadiwegakmnvb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403121/normal_5fee656feb5b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392215/normal_6002d7518cff6.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/xamibebulosaxug/64509728637.pdfIn PDF document text
    • http://doledakejopoted.rf.gd/62168093577.pdfIn PDF document text
    • http://nusilemil.epizy.com/sql_server_2017_format_code.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/simple_website_templates_using_css_and_html.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_off0000c870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC870 5420 bytes
SHA-256: 13e5cdffd5b37a389a10d8c6e478509c9af4e536c08321da2aa818f6f16e496e
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 9684 bytes
SHA-256: a1dc6187fe673be3d73ff7a03b93be65b4d49f1841025806704864126c93d236

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