Malicious PDF — malware analysis report

Static analysis result for SHA-256 808593f5c4f67cb0…

MALICIOUS

PDF

109.7 KB Created: 2021-02-22 14:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 042f3e1c895608ebdf75ce7bdc8a0cef SHA-1: cd5b60ff42c943c063b8a1b731ee0bb818c53841 SHA-256: 808593f5c4f67cb0fa96ab5a345e28e327a47315a1c9cc6fe928b57729304dbc
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically pointing to 'seumenha.ru' and another to 'pixelbarista.com', suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, likely used to obscure the true malicious destination.

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://seumenha.ru/strik?utm_term=star+wars+canon+books+after+return+of+the+jedi PDF link annotation
    • http://pixelbarista.com/zetuxulagiputufekupi8y8mc.pdfIn PDF document text
    • http://agentsecure.space/mac_os_define_android_sdk_rootyrrj5.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/iheSjcw/folid.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/jaOhi4m/marshmallow_root_for_hair.pdfIn PDF document text
    • https://dotudamel.weebly.com/uploads/1/3/5/3/135326114/powupaf_buxajigewosusof.pdfIn PDF document text
    • http://zufunepel.iblogger.org/ramadan_activity_book.pdfIn PDF document text
    • http://milansit.space/the_crown_season_2_episode_6_fact_checkh7w8k.pdfIn PDF document text
    • https://funesovikigaje.weebly.com/uploads/1/3/0/7/130740183/1e99d322c502f41.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/hgyhc0O/yellow_fins_selbyville_delaware.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/endorsement_form_cg_20263u3fo.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/tjhibyS/lucky_block_addons_java.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://surusulo.rf.gd/aol_shield_for_windows_xp.pdfIn PDF document text
    • http://kalilom.epizy.com/runescape_auto_typer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/accurip_black_pearl_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/47082123732.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/98725663280.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_off00016cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBF 5552 bytes
SHA-256: a6bfeaee7f355e498b225dbae488060aa9750cf14cfdf097ff00f4fcec1051bb
font_01_sfnt_off00017fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB3 12764 bytes
SHA-256: 03e5376e44e83369c8b9abaaad7a32d2bac99d0a5e33a1cacb887d0e7e341497

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