Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc5fb3e8bff0c82…

MALICIOUS

PDF

79.6 KB Created: 2021-04-12 16:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5e8aa6b2f576627c5ffbe72d1d72d94a SHA-1: 27dcfafc34ef969b6988aaeb7819eb8ebab1745d SHA-256: 3fc5fb3e8bff0c82bc4b9880ee1279f3ada333bc3cb5c18efcaa034a7d281cdf
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, likely intended for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a product search, suggesting a lure to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=behringer+mixer+502+price PDF link annotation
    • https://cdn.sqhk.co/sixerusesebu/hfo8jcq/super_why_phonics_fairy_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/rijunawep/i3gjAgf/aosp_launcher_3.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/UiijbcT/radio_italia_anni_60_trento.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/g6pjbhi/mcdonald_s_brooklyn_ny_11207.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/76783439125.pdfIn PDF document text
    • https://cdn.sqhk.co/setewefasari/YsWLSVl/24146564537.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/heejdjg/808105690.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/2hjNWF2/temporary_business_visitor_visa_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/wavivatus/TgcrbUr/59447598323.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/60225079786.pdfIn PDF document text
    • http://stickerrus.ru/dragunov_sniper_rifle_warzoneska78.pdfIn PDF document text
    • http://cartest.pro/denibazawez5411p.pdfIn PDF document text
    • http://film123watch.com/27136267255a4b0s.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/assault_bike_workouts.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/hDig0gg/5443215081.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/bajapovogam/69910704910.pdfIn PDF document text
    • http://nupokibe.epizy.com/angka_penting_dalam_fisika.pdfIn PDF document text
    • http://bomowufawifebi.rf.gd/poesia_de_amor_alfonsina_storni.pdfIn PDF document text
    • http://xosapexotakub.rf.gd/basic_concepts_of_cloud_computing.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/cbest_practice_test_2018.pdfIn PDF document text
    • http://zigimavabixexib.epizy.com/22424681025.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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 5444 bytes
SHA-256: 6950706802b9364f73a99c01d9dab3e13efb0286654ae6b4d760f92714859234
font_01_sfnt_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 12448 bytes
SHA-256: 9265bbf032bfd6c70a193000f2914cdffe810b218a583d8f8d369abd890bc413

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