Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f3c2e2defb6db1…

MALICIOUS

PDF

76.2 KB Created: 2021-03-23 04:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 042b6d73fd8dc1cb0a5e6320f5a5acd1 SHA-1: 5f4435be15ea73aa13c3e5649b25336d020b3e84 SHA-256: 20f3c2e2defb6db108e003274c91e22d06252914338002cb6b1ec6b3df4b0729
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and link farms, indicating a likely SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jacksth.ru/wix?keyword=northville+central+school PDF link annotation
    • https://cdn.sqhk.co/wanaxowuwot/egg4UB8/83767973841.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/gijipe-rojorolodeg-ledebowo.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/uAeMiiy/dissidia_final_fantasy_opera_omnia_characters_ranking.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/3j0zdov/19504146922.pdfIn PDF document text
    • https://xozavefo.weebly.com/uploads/1/3/4/0/134018900/regexujuwo.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/similarities_and_differences_between_mitosis_and_meiosis.pdfIn PDF document text
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/2741037.pdfIn PDF document text
    • https://xesizoge.weebly.com/uploads/1/3/1/4/131452949/2734549.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/giuBYhj/23080626445.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/fjdjfhe/zombie_dying_island_survival_mod_apk.pdfIn PDF document text
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/934240.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/75162845352.pdfIn PDF document text
    • http://gopadaxin.mywebcommunity.org/turezutipidemojufapek.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/makixibawumebol/navapisesudajab.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/aging_population_problems.pdfIn PDF document text
    • http://jofifabe.rf.gd/cinema_paradiso_theme.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/72559187208.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/22297660131.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/2_step_equations_worksheet_free.pdfIn PDF document text
    • http://towawopijoxodor.rf.gd/list_of_integrals_of_trig_functions.pdfIn PDF document text
    • http://genenapukiral.epizy.com/a_gentleman_full_movie_480p_bluray.pdfIn PDF document text
    • http://pesipobigon.rf.gd/28732044211.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/bavisepi.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/career_objective_for_performance_tester.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/pathophysiology_of_seizures_and_epilepsy.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/34862018335.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_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 4916 bytes
SHA-256: 34712861c8aeed3d7165a7d2c882aab106b9ef4c46d9950e70a39547cbe37c50
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 10996 bytes
SHA-256: aaa439e24ea914e8b848b9907fbb9e85fba9c4eacbd415b074884958add20859

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