Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8871c56f1e527f…

MALICIOUS

PDF

75.1 KB Created: 2021-03-26 08:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6804f1192362cdfe5055302f57460d9b SHA-1: d55d6c201e217b3f8f5161747ae21f7c37f7b08e SHA-256: bc8871c56f1e527fdbcb60647110f3e2c65ed9e6dbb2b9bbb5a4b5ad1d818cc5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing 30 external links, and a ClamAV detection for Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The embedded URLs and the PDF link farm suggest an attempt to redirect users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=alpha+form+labs+sarms
    • https://poxosuliw.weebly.com/uploads/1/3/1/3/131383655/duvegikaji.pdf
    • https://cdn.sqhk.co/kisasizaro/hhejg08/on_my_own_chords_patti_labelle.pdf
    • http://katermore.ru/297844793242p2y0.pdf
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5fe45e4f23082.pdf
    • http://amorexpo.com/improve_left_hand_dexterity_pianoqkda7.pdf
    • https://cdn-cms.f-static.net/uploads/4401732/normal_601bfc646541f.pdf
    • http://gikepofazanapol.mypressonline.com/32414587477.pdf
    • http://montana-media.com/anexar_a_wordf2lbv.pdf
    • https://cdn.sqhk.co/pumibavi/ixidghJ/64632667544.pdf
    • http://dusipoweg.mywebcommunity.org/1_metro_cuantos_hectometros_tiene.pdf
    • https://cdn.sqhk.co/wifopuzuxiba/1ichhXA/lakalosojuridelu.pdf
    • https://cdn.sqhk.co/dukapudubi/Najcjdh/88861042056.pdf
    • http://vubitim.sportsontheweb.net/pezerewojelowexutesukap.pdf
    • https://cdn.sqhk.co/tadawatimi/glijiaR/how_to_go_viral_on_youtube_2020.pdf
    • http://dotavulilego.mypressonline.com/33783117288.pdf
    • https://saposoralax.weebly.com/uploads/1/3/6/0/136025319/kutizodikal.pdf
    • http://potenciy.xyz/emotional_songs_2018o59yx.pdf
    • https://cdn.sqhk.co/rasetiwulipu/GHhficl/tanks_a_lot_removal.pdf
    • https://cdn.sqhk.co/gizukakom/dSNZjh1/20421391996.pdf
    • https://wewowalowumuv.weebly.com/uploads/1/3/4/0/134040384/4475789.pdf
    • http://devlp.design/43396219815ninx.pdf
    • https://jazebaza.weebly.com/uploads/1/3/4/6/134662006/pevukupip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://farovosodiwes.atwebpages.com/vida_y_muerte_en_la_mara_salvatrucha_main_characters.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_off0000e5e5.bin
0f6cc4099ade1e1087cc77ed230d1ccc0abfa1ce8511ab424c22243562598e50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 5268 bytes
font_01_sfnt_off0000f7a3.bin
24c900211023ad24591ac1084e977261dd296f5fa962b924aa1ba92054c3e3d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 11096 bytes

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