Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cabe5205a19c9c…

MALICIOUS

PDF

80.2 KB Created: 2021-02-25 20:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4e286539a7abfc88dda1c6f0f9cc051c SHA-1: d28b7ecd183d6f25403152c0d0ae0261c5ea5e3d SHA-256: 83cabe5205a19c9c0c9b77840c268ae2367771e48b54e8fd86b9e02af3b0b938
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the nature of the embedded content point towards a spearphishing attachment, likely leading to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=aliiolani+craft+fair+2020 PDF link annotation
    • https://cdn.sqhk.co/tosijoxopum/ihhiW7j/jowimefufababobul.pdfIn PDF document text
    • http://znalomstvavip.site/38783997417d7psd.pdfIn PDF document text
    • http://tiktoktop.design/what_is_dangerous_high_blood_pressure_in_pregnancy56rmo.pdfIn PDF document text
    • http://my-favshop.online/fizaz7iptk.pdfIn PDF document text
    • http://load-bcp.com/bellman_job_descriptionkw8vr.pdfIn PDF document text
    • http://lamovingcompany.com/five_nights_at_freddys_game_2_demoxer33.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/hhhiheC/44057046317.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/NeLYWje/origami_furniture_how_to_make_paper_craft.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/NMjaTgd/giwasemabazekenabumivi.pdfIn PDF document text
    • http://dithetsen.xyz/the_martian_movie_worksheetzx6gl.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/dsgisid/43408504230.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/qGzhaa6/ambient_night_lights.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/fyhhibH/encyclopedia_brown_boy_detective_reading_level.pdfIn PDF document text
    • http://mif-smeh.space/crack_bones_in_backca3tc.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/pgc3n81/chat_american_grill_scarsdale_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/Usgijbk/cartoon_plus_size_fashion_show.pdfIn PDF document text
    • https://cdn.sqhk.co/siganewita/gebPhfD/zombie_exodus_safe_haven_romance_bailey.pdfIn PDF document text
    • http://good-production17.site/how_to_connect_firestick_remote_to_tv_to_control_volume1jkbr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 4960 bytes
SHA-256: c4ce52b1a93868fdf3e28685279dcc9f9b584b6996b4062b57d8abd2f0759f6a
font_01_sfnt_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 10636 bytes
SHA-256: 6733fa8cae86d6d4d26d0b39aeeb5856e3a29c8574aac4cea48e6044bd72fbaf

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