Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a37af0e915e282…

MALICIOUS

PDF

70.8 KB Created: 2021-02-16 09:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0e7cd261b78623f48988b289142e694b SHA-1: 8d5c9f12e9b0d9f606f7b783fde023966c079f0b SHA-256: 81a37af0e915e28218b74a80905ab65e8347716999aa833fc25c950844a8730d
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to disposable domains, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to appliance troubleshooting, designed to trick users into clicking malicious links.

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://druttle.ru/wb?keyword=why%20are%20all%20the%20lights%20flashing%20on%20my%20indesit%20dishwasher PDF link annotation
    • http://org-fruit.space/pofudowexolujogapaxmd5.pdfIn PDF document text
    • http://esagafow.fun/netflix_laptop_windows_7tsv7h.pdfIn PDF document text
    • http://euroshopmn.space/47083079944ukwl5.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/rgdjeuf/52516944655.pdfIn PDF document text
    • http://goodsun.fun/70090135974zkdt.pdfIn PDF document text
    • http://yeswins.space/43560957204yu3wr.pdfIn PDF document text
    • http://curvepreloved.com/venice_travel_guidelinesriqs2.pdfIn PDF document text
    • http://dektesheff.xyz/colosseum_model_mayabyk0i.pdfIn PDF document text
    • http://promooffer.site/82988652620i8cq1.pdfIn PDF document text
    • http://ehaberdevlet.com/blood_relation_questions_in_gujaratijra40.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/47muJVh/kumodemupuro.pdfIn PDF document text
    • http://boldly-grow.com/outlook_email_template_builder53uba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/panokojol/excel_vlookup_function_across_multiple_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/11198737987.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/goku_y_los_androides_19_y_20.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/gasisegewuruxogumujewada.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/bed_bath_and_beyond_cotton_percale_sheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 5316 bytes
SHA-256: 59e4139f7738fc19008ff790edab17d5ff8356636f9fdef87ea3e6c020c78396
font_01_sfnt_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 10168 bytes
SHA-256: eeb3c6e7cc12f778cf4a343f5f85e5b39cd1f68c25a12c71c9cc92822bc01be6
font_02_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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