Malicious PDF — malware analysis report

Static analysis result for SHA-256 188f99aa1e87ef25…

MALICIOUS

PDF

80.0 KB Created: 2021-03-15 12:00:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ebd3d286dc2378aec023f93548c1f38d SHA-1: f4df20cefc315a2e497dc93a6a05b4a78ebaccab SHA-256: 188f99aa1e87ef25689aad0e4e5541d47acea1cf7c07d9cfea8f8a70614d2fff
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=printable+brain+teasers+worksheets+pdf PDF link annotation
    • http://cosmicgig.com/husky_1500_lb_portable_workbench_manualkytuy.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/ghiaiid/cookie_clicker_3._0.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/xuramipovegovo.pdfIn PDF document text
    • http://arfeshome.com/omron_h3cr-a8el_manual48xj4.pdfIn PDF document text
    • http://doguzunagenuxo.22web.org/kovulaboferon.pdfIn PDF document text
    • http://moshon.space/resource_cfg_downloadlrk5j.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidaxiwuk/RMkyjHA/63833713984.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/13heKge/full_list_of_al_green_songs.pdfIn PDF document text
    • http://mosaniz.22web.org/pseudomembranous_colitis_treatment_guidelines.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/wivupilu.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/jfjaIji/play_poker_offline_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tajavujexiz/8yiKgee/defender_hd_1080p_4ch_with_4_bullet_cameras.pdfIn PDF document text
    • http://euromarket.pro/41981540319jjtsd.pdfIn PDF document text
    • http://axacheat4.xyz/project_manager_job_salary_torontolt94z.pdfIn PDF document text
    • http://abzac.me/air_force_1_white_high_top_mensagxax.pdfIn PDF document text
    • http://jexekiraj.sportsontheweb.net/lewoganevizina.pdfIn PDF document text
    • http://se-mrush.com/what_is_the_default_password_for_netgearsopzk.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://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_ccadda85aba546cd8a59553e3491a5ec.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_1bba5e74efdb4542a4eb9723afc9a5b7.pdf?index=trueIn PDF document text
    • http://zigadewat.epizy.com/maytag_3000_series_dryer_diagram.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_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 5212 bytes
SHA-256: 6e1f71ebe565a362736085ab76076ed5a4fe5349fd54b76978aecbb25bed4310
font_01_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 10620 bytes
SHA-256: eab6b6bb47726742ff889809474cd480f255983ab919ba5075f8efd70ad3b4ea
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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