Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b5eb4f2f6b0a2e…

MALICIOUS

PDF

67.7 KB Created: 2021-02-10 00:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2846cb8c5f9ae08c695e650d0e685bf5 SHA-1: 819aee357f49ab9f38ba6ee04588029607f92b07 SHA-256: 71b5eb4f2f6b0a2ecc8abd24eb62ea35d0ca7bce40ffe5bcc228908b556f609e
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and forming a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

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 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.
  • 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://druttle.ru/wb?keyword=signing%20authority%20change%20letter%20format PDF link annotation
    • https://cdn.sqhk.co/titabofasika/ibhjbrX/my_lps_wish_list.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/tamofuxfi07c.pdfIn PDF document text
    • http://vbruti.site/kogafoxokifiboh3g5f.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/svlLjat/stick_war_3_hacked_unblocked.pdfIn PDF document text
    • http://idealica-ufficiale.site/laweluxufixuzupipibi6ab9a.pdfIn PDF document text
    • http://copyrightviolationcenters.com/gopiveteno0919j.pdfIn PDF document text
    • http://jokidinavefo.22web.org/1_dimensional_motion_physics_worksheet.pdfIn PDF document text
    • http://gidilixad.66ghz.com/38741153668.pdfIn PDF document text
    • http://nesapumedavemag.iblogger.org/new_hd_bollywood_movies_2018_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vozogekom/gjgibib/rekifegatufi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://varaxekewuveza.epizy.com/aeroflot_a330_business_class_trip_report.pdfIn PDF document text
    • http://gaxodusipif.epizy.com/3d_smartart_for_powerpoint_free.pdfIn PDF document text
    • http://bixasejefo.rf.gd/aleister_crowley_777_espaol.pdfIn PDF document text
    • http://zarazemudaseri.epizy.com/inguinal_canal_anatomy.pdfIn PDF document text
    • http://jijazofar.rf.gd/sad_breakup_wallpaper_hd.pdfIn PDF document text
    • http://bakilipos.epizy.com/professional_binder_cover_templates_word.pdfIn PDF document text
    • http://jijazofar.rf.gd/vobikijavelododupepoja.pdfIn PDF document text
    • http://dakawat.epizy.com/apache_commons_codec_1._11_jar.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_off0000cd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD50 5320 bytes
SHA-256: 07eccc4525423bc825dc3cead3cb27726d6293c00655d13331abd76b503dd509
font_01_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 10088 bytes
SHA-256: 629d6a768e37b25ab62d963523c5f3b571ab141a377122d395b3dd7b920e9be1

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