Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddfdf7444433524…

MALICIOUS

PDF

87.5 KB Created: 2021-03-05 22:28:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 828c30a77844d3a2036add2bcfb0a55c SHA-1: 3aece6a5c8be7d20cbe457041850ddd1bd9cc7d5 SHA-256: 8ddfdf74444335242587dbc67664be4a6f5d86aa2216fd43172352b4d21981df
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links pointing to various domains, many of which are hosted on disposable or suspicious infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a link farm designed for phishing or malicious redirection. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's output suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=english+101+college+book PDF link annotation
    • http://pitukegurajokup.22web.org/the_mis-education_of_the_negro.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/worubalvzno0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425917/normal_600371081b707.pdfIn PDF document text
    • http://kenanimit.iblogger.org/kolonesukudojimegefisegi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451049/normal_5fed0595375ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_6015122629dfd.pdfIn PDF document text
    • http://ranking-se.com/8084247032862g9m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_602c3443519d3.pdfIn PDF document text
    • http://nutejujaxi.66ghz.com/archery_apk_indir_android_oyun_club.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416810/normal_5ff1feac26ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_600e122761cd9.pdfIn PDF document text
    • http://drenajkrasnodar.ru/fubununawadewilupijtz6np.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_f556754664fc41ef82c150c1a2e59e73.pdf?index=trueIn PDF document text
    • http://leremijidi.rf.gd/41713564009.pdfIn PDF document text
    • http://xidutukas.epizy.com/masque_of_the_red_death_theme_quotes.pdfIn PDF document text
    • http://fizanotafogibag.rf.gd/how_to_draw_simple_eyelashes.pdfIn PDF document text
    • http://zuronixo.rf.gd/novoxemagupimitexaragalex.pdfIn PDF document text
    • http://zebezepewit.epizy.com/zuzexizetoneji.pdfIn PDF document text
    • http://kesekerezox.epizy.com/96580914750.pdfIn PDF document text
    • http://bogizun.epizy.com/eye_has_not_seen_nor_ear_heard_bible_verse.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_907563d9e53d4b148216178c076a7932.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 2940 bytes
SHA-256: 5205dc029b2d4b0ae44ddd8c96d056e1801b9f6b3c115db4e44038fa36e83b83
font_01_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 5108 bytes
SHA-256: 18a677992f14698fd3a70f12927e539c45638a446bddcf5b8e6098e1cdbe468c
font_02_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 10624 bytes
SHA-256: 57b860171edcc65b32a1cdf53275b99264b653b39aff21ca46623f7bc86223c6

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