Malicious PDF — malware analysis report

Static analysis result for SHA-256 e433fdb4c7652e39…

MALICIOUS

PDF

72.7 KB Created: 2021-01-17 21:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c2ed360f1013809d115cdbec70028446 SHA-1: ea779a066d1ea2bdf58f24bda711ca32a271250c SHA-256: e433fdb4c7652e39270d62eaf1f4b65aae172a6a1b73e3b4cce8035f808430ac
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous links to disposable hosting and redirectors suggests a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://traffking.ru/123?utm_term=hempy+bucket+diy In PDF document text
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/mesidog.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/5sxrSlL/japopasusago.pdfIn PDF document text
    • https://site-1168006.mozfiles.com/files/1168006/gofijuxemaki.pdfIn PDF document text
    • https://site-1250167.mozfiles.com/files/1250167/simile_metaphor_personification_worksheet_4th_grade.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/2edb5eb53c6.pdfIn PDF document text
    • https://bagosuberabuvi.weebly.com/uploads/1/3/4/6/134681771/9906576.pdfIn PDF document text
    • https://rusekawavupor.weebly.com/uploads/1/3/4/0/134096427/ruwuzi-renad-susezudexoxatu-kuzazisekifoma.pdfIn PDF document text
    • https://site-1166674.mozfiles.com/files/1166674/tefinotegilujavixoguvukil.pdfIn PDF document text
    • https://site-1175722.mozfiles.com/files/1175722/vopamajux.pdfIn PDF document text
    • https://site-1178374.mozfiles.com/files/1178374/72357600732.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
    • http://xebowuruno.epizy.com/applications_of_nanotechnology_ppt_free.pdfIn PDF document text
    • http://tegiledo.epizy.com/fanilom.pdfIn PDF document text
    • http://rivelik.epizy.com/music_notes_vector.pdfIn PDF document text
    • http://jidoreno.epizy.com/surarero.pdfIn PDF document text
    • http://merizipu.rf.gd/body_of_lies_full_movie_moviescounter.pdfIn PDF document text
    • http://pamakejexo.epizy.com/66187160514.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_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 4636 bytes
SHA-256: adbf4d6bc4e60d625d389147a938059d01953b8290173b52cb9a3633fb58e978
font_01_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 10252 bytes
SHA-256: 98996b8abc5bf9d33b19cfea06b81ab0b38b7b3a2c050368efeb7d18e3061b79
font_02_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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