Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d5348d258644e4…

MALICIOUS

PDF

75.8 KB Created: 2021-04-02 00:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f040fd13812bd95fbf2c77f8d1bf2681 SHA-1: d5dafc6ebde6b44c1b0ab51a898813aa2ff3325c SHA-256: c2d5348d258644e402b15b3b42d92a1ceda64ef59044b013eba0ddf2632f0996
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to various domains, many of which are disposable or associated with link farms. Heuristics indicate these links lead to malicious redirector infrastructure and a link farm, suggesting the primary purpose is to direct users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://yafferge.ru/strik?utm_term=elements+of+art+shape+powerpoint In PDF document text
    • http://kekewawoxugar.sportsontheweb.net/ungleichungen_aufgaben_mit_lsungen.pdfIn PDF document text
    • https://cdn.sqhk.co/vojeruzujuzi/imTTrjf/chemical_engineering_mit_forms.pdfIn PDF document text
    • http://biomanua.website/formal_wear_hire_mandurahz9066.pdfIn PDF document text
    • http://strita.space/73710338165laucb.pdfIn PDF document text
    • http://prodson.space/mass_effect_andromeda_kadara_ransomo0qlc.pdfIn PDF document text
    • https://cdn.sqhk.co/bitubebo/gcVe1hb/26133892887.pdfIn PDF document text
    • http://rineset.xyz/how_to_clean_shark_iron_platempsdy.pdfIn PDF document text
    • http://artistichomesolutions.com/shark_ion_robot_r75_vs_roomba_670ai2pb.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/bhghhCU/23329769212.pdfIn PDF document text
    • https://cdn.sqhk.co/winexumalov/6yjhpji/contaminated_land_report_example.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/jXgdabq/soccer_kings_hull.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/f77YEcr/basketball_goal_height_regulation.pdfIn PDF document text
    • http://ipoteka.net/fuwidulitkp37.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/arithmetic_sequence_and_series_test.pdfIn PDF document text
    • http://musc-media.xyz/casio_wave_ceptor_manual_335319h82.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/sitaraga.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/cjbjhia/89558856763.pdfIn PDF document text
    • https://cdn.sqhk.co/fazofasufiwu/Djfjja8/30967010284.pdfIn PDF document text
    • http://instapodarok.site/96834642275ozzo2.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/lekorirozikijusefulirabu.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/pSq8lMB/42555041317.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_ca796e982b90485782a1be0d04985855.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_3401134033664ad79d6e4aa8024da919.pdf?index=trueIn 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_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 5188 bytes
SHA-256: ff2bfec6f4334b6b9da4541d6663e0eaeead985842317f43044ddbca0c9e7832
font_01_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 11088 bytes
SHA-256: 5c16d4de6f94fcdff47fdabca8895da7f63eebd90425959748c87e191cbaedba