Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16e45f8e6ff30fe…

MALICIOUS

PDF

75.9 KB Created: 2021-04-04 22:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a19b8bd1fc6d285ece3725e5503cab7 SHA-1: bed5288294e9356ea757b0f90982ac2d8bcca659 SHA-256: b16e45f8e6ff30fe50c6abfb53e80d628e0a10a11c7d8427735ceeaeabf46227
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO manipulation tactic. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent to deceive users. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=unix+and+linux+system+administration+handbook+pdf+free
    • http://artistichomesolutions.com/business_communication_notes_b._comuu5ra.pdf
    • https://xanosetad.weebly.com/uploads/1/3/1/1/131163691/nimurawi-dupafivaxarimuw.pdf
    • http://zutelotojenexop.getenjoyment.net/pharmacology_mnemonics_free_download.pdf
    • http://mbfsopg.com/33218562936ythvw.pdf
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/juvodetinut-ruges.pdf
    • https://nazumuliwoj.weebly.com/uploads/1/3/1/3/131383416/besib.pdf
    • https://lalexitadonu.weebly.com/uploads/1/3/0/7/130776325/kipomovimirimuden.pdf
    • https://labudadujuw.weebly.com/uploads/1/3/1/6/131637223/jubajasulegoniw.pdf
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/moruwasaga_lejuxubasob.pdf
    • http://nedavupagisezim.mygamesonline.org/iodine_value_determination.pdf
    • http://bbbbbbbbeeee.space/ledojazuzuzuwunisenams8uz.pdf
    • http://kigurumi.org/ransomes_bobcat_for_saled7x27.pdf
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/560827.pdf
    • http://mofemaruwek.sportsontheweb.net/anatomy_trains_posters.pdf
    • http://bimovixexena.scienceontheweb.net/audincia_de_custdia_no_processo_penal_brasileiro_livro.pdf
    • https://nikizatul.weebly.com/uploads/1/3/5/3/135309179/7a5fa.pdf
    • http://helplnstagramcontact6088756.com/jaws_original_book_cover110bi.pdf
    • https://desotidibig.weebly.com/uploads/1/3/0/7/130775813/9750b.pdf
    • https://javabudonoban.weebly.com/uploads/1/3/2/6/132683403/630600.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://weverikovufom.rf.gd/mikatimojinujolosofuxopaz.pdf
    • http://mefufoseza.rf.gd/gomupenon.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_off0000def9.bin
c989fb05d6cd935fa0c64e561c3b1e89a274bc6b0b8fe80ab9df755b50c38f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 5644 bytes
font_01_sfnt_off0000f20b.bin
3ede84223265bdd92f1948e36ff48002ad447c4cc8bddcd5bdc174bbc5691945		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 15400 bytes

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