Malicious PDF — malware analysis report

Static analysis result for SHA-256 f001daa7c355a3ab…

MALICIOUS

PDF

94.5 KB Created: 2021-03-18 13:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 41332f8314d08198bd8037e642fe20cb SHA-1: a3e24a67d3ac9bdd7d8b1b0d0cbb03a803783ad9 SHA-256: f001daa7c355a3abda158234f0855cb41193dbc796cc6922d7668e27f98d5165
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting or redirector services, indicating a link farm designed to distribute malicious content. The heuristic firings confirm the presence of malicious redirector links and a link farm, and the ML classifier strongly flags the document as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=os+the+fall+based+on+a+true+story In PDF document text
    • http://fanitukasi.22web.org/bejubuworabeke.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/09b2ab6dafb.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/h3LhfbE/skylanders_swap_force_xbox_one_target.pdfIn PDF document text
    • https://bujubisagakib.weebly.com/uploads/1/3/4/3/134323903/1e382600d1250d.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/fWjd1vE/razalean_pm_reviews.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/2284421.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/wenapiwewiweke-sizofimowiw.pdfIn PDF document text
    • https://sigiduba.weebly.com/uploads/1/3/1/3/131384121/penajiribeva_puvexusudivusez.pdfIn PDF document text
    • http://tcerkovniekupola.space/46577219030a0f7c.pdfIn PDF document text
    • https://fomikozifu.weebly.com/uploads/1/3/4/5/134511133/vojufanuzemabu.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/jjtifCz/52210581931.pdfIn PDF document text
    • https://ledejikijosud.weebly.com/uploads/1/3/1/6/131607919/fuzekobanujinen-tizul-degubofetov-rapuxume.pdfIn PDF document text
    • https://wexaluzeneroxer.weebly.com/uploads/1/3/0/7/130776054/7738971.pdfIn PDF document text
    • http://gnfcns.info/intermatic_light_timer_instructionsq5mul.pdfIn PDF document text
    • http://vinograd.io/14996473663kzmyu.pdfIn PDF document text
    • https://zozolesib.weebly.com/uploads/1/3/4/6/134631165/7652571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_601dfd46bc06c.pdfIn PDF document text
    • https://mixabukosi.weebly.com/uploads/1/3/4/4/134479433/5293394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486353/normal_602458fd7ea04.pdfIn PDF document text
    • http://ketotreno.buzz/introduccion_caracterizacin_y_organizacin_de_la_pequea_empresa_latinoamericanayu9ps.pdfIn PDF document text
    • http://perfectiona.online/lafidepategasinuzidals.pdfIn PDF document text
    • http://rajedat.iblogger.org/ctet_question_paper_2019_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/ijchdic/7219255016.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kubuxakul.epizy.com/kefulunem.pdfIn PDF document text
    • http://vudubozudavoso.rf.gd/rivudeg.pdfIn PDF document text
    • http://ritanuwo.epizy.com/rixinikumuv.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_off00012e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3F 5264 bytes
SHA-256: 5a4f29edeeab986011c5fc328ae5086decc148d1668c5f3c19ee20cdce765cf6
font_01_sfnt_off0001401f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401F 13008 bytes
SHA-256: b66f153f41a8e97a5a89027e6052f1d03ce832afb8b101cd7ad02c140afd27c2

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