Malicious PDF — malware analysis report

Static analysis result for SHA-256 734cb6dfb6f25026…

MALICIOUS

PDF

72.7 KB Created: 2021-02-20 18:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d2c4e0aa413b0242e99937e8e731f63 SHA-1: 76527d47de1caf7c684f5816c507ae376ad87649 SHA-256: 734cb6dfb6f2502627b4a45aba7ca094e712e65966ce43cb10b1f92026c65908
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to "Windows 10 for beginners pdf download", indicating a lure to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=windows+10+for+beginners+pdf+download PDF link annotation
    • http://googsnat.space/feledob25tf.pdfIn PDF document text
    • https://cdn.sqhk.co/razilipot/ifieeTm/kulefigorikopok.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/wiahjB0/live_tv_streaming_apps_free_trial.pdfIn PDF document text
    • https://dajikunizitawis.weebly.com/uploads/1/3/1/1/131163857/dakizexeta.pdfIn PDF document text
    • https://cdn.sqhk.co/fetadupozo/GejcIgg/21928423219.pdfIn PDF document text
    • https://fetezubusob.weebly.com/uploads/1/3/2/6/132681625/6185439.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/gjZ8giR/disney_movies_about_family_love.pdfIn PDF document text
    • https://gibiboxovozigux.weebly.com/uploads/1/3/4/7/134722082/bozabanak_rifatuna.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/P8hgjhf/transmission_fluid_flush_cost_canadian_tire.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/b08687f9ae60f.pdfIn PDF document text
    • http://vehicleusains.com/lagu_alika_aku_pergi_freeyh5vr.pdfIn PDF document text
    • http://private-channel.site/fill_in_3d_mod_apk_downloadubehm.pdfIn PDF document text
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/22071fe548a3488.pdfIn PDF document text
    • http://fishing-rods2.club/romiwigovelazeximubawerabem9a.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/fajujiju/artifactory_latest_artifact.pdfIn PDF document text
    • http://difugarulid.epizy.com/nurifoduxuzonusote.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/curry_6_performance_review.pdfIn PDF document text
    • http://gimemos.epizy.com/40619040211.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_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 5648 bytes
SHA-256: 25c0c89359c95a735486fcc246d1cee0a0357787230662b27b59e7e4d2b041ea
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10240 bytes
SHA-256: 09af67ff017521912128a440bc0f7db8adf90e6f2d0fcfdd370e3aa8bf4b8e96

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