Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63ce7dfb42a7ce4…

MALICIOUS

PDF

79.6 KB Created: 2021-05-02 12:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e47b2fdb691699bec07557586dbe84d4 SHA-1: e59ecc3a7b67545a3e4e3e4a1bf952efeceb394e SHA-256: b63ce7dfb42a7ce4353a789c5988e3b9636096ef4719fa94329450baa4bfb785
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one leading to 'jumiwimov.ru', suggesting a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content.

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
  • 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://jumiwimov.ru/strik?utm_term=is+mitsubishi+eclipse+cross+a+reliable+car
    • http://xejepurefe.scienceontheweb.net/calculus_early_transcendentals_7th_edition_metric_version.pdf
    • http://consumer-data-protection-bureau.com/mosque_pronunciation_guideb5f1p.pdf
    • http://rotawafuwuno.scienceontheweb.net/cnc_machine_types_and_uses.pdf
    • http://testvvd.xyz/why_is_the_term_primary_group_important_to_differential_association_theoryu5b6t.pdf
    • http://sazaleve.22web.org/nemakujej.pdf
    • https://xipakopubax.weebly.com/uploads/1/3/5/9/135966228/9898849.pdf
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/leliparosor.pdf
    • http://appeal-ig.com/23179689537nnqjg.pdf
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/joraw.pdf
    • http://blacktea.space/retagulilbql1s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://witozarelopisi.rf.gd/67665737275.pdf
    • http://vebagakid.onlinewebshop.net/balanced_scorecard_sample.pdf
    • https://s3.amazonaws.com/dazuxujepov/fofavixudikakisen.pdf
    • http://damowepoko.myartsonline.com/can_you_hyperlink_table_of_contents_in_word.pdf
    • http://rususekobijo.myartsonline.com/what_is_a_female_boss_called.pdf
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_6e08170c34824f16bf68a524ee9d8e55.pdf?index=true
    • http://vepoxogovake.epizy.com/my_dometic_fridge_not_working_on_gas.pdf
    • https://s3.amazonaws.com/marimejerebo/84522901099.pdf
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_5fe64863f8d04cf5b769ad0474163ea5.pdf?index=true
    • http://rotitow.rf.gd/49428961569.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa25.bin
18e7fa01345f098f1f9345648ab1b388852bb287a124d52e4eb7c1ab34fb4a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 5248 bytes
font_01_sfnt_off00010bcb.bin
308afbd11860e635876755cd7bd23b4bd55f09db51775d45485e1a903cd818a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 10860 bytes

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