Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7320d48e0194536…

MALICIOUS

PDF

82.6 KB Created: 2021-02-28 06:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 58cdf45e00823bcb4d43ecfff0f0e66c SHA-1: aff7ead3b3a98cb173cc806339bebb573bfda59f SHA-256: e7320d48e01945365eaefab917be5cbe943e0239e511c5a1ba4fe0a6f7463ca0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The primary URL, https://kuzutuzo.ru/wb?keyword=which%20red%20wine%20is%20good%20for%20beginners, suggests a potential SEO manipulation or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wb?keyword=which%20red%20wine%20is%20good%20for%20beginners PDF link annotation
    • http://giocodigital.fun/how_to_solve_for_half_life_in_calculus_problems57l7y.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/92105267318.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/wakidafekulowi-sirelazom.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/music_theory_major_scale_worksheets8vqcg.pdfIn PDF document text
    • https://natutiwuv.weebly.com/uploads/1/3/6/0/136019317/fenololimuwaba_rerurikanaliz_vopafiz.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/rugitujugikakus.pdfIn PDF document text
    • https://juzajepilokak.weebly.com/uploads/1/3/4/6/134682244/pumomisog-filabulejoge-pafenuwuzi-zodep.pdfIn PDF document text
    • http://lusaxesa.iblogger.org/bausch_and_lomb_multifocal_fitting_guide.pdfIn PDF document text
    • https://noxetetejiv.weebly.com/uploads/1/3/4/3/134391164/1503239.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/how_to_change_honeywell_pre_filter.pdfIn PDF document text
    • https://jufoximivovanad.weebly.com/uploads/1/3/4/0/134013024/3b268a14.pdfIn PDF document text
    • https://tenigirexono.weebly.com/uploads/1/3/4/6/134645883/714062.pdfIn PDF document text
    • http://hook-up.fun/ampicilina_comprimido_bula5c3v6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xorosobodudirug.rf.gd/wagujelegigizoxig.pdfIn PDF document text
    • http://bodagoge.epizy.com/question_answers_of_no_men_are_foreign.pdfIn PDF document text
    • http://gikumud.epizy.com/malaguena_classical_guitar_sheet_music.pdfIn PDF document text
    • http://pikiregofi.epizy.com/buduromik.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_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 5284 bytes
SHA-256: 08ffe019b40b89a9b97277778b31b87bcd530e6fe6b718f3dd396207e60e9870
font_01_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 11156 bytes
SHA-256: d2527aa32b2c46b6e633292c2aeef93e62b4664d44996215891de1de73f01e88

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