Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d28b557e496d4d8…

MALICIOUS

PDF

86.8 KB Created: 2021-04-07 03:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 50aaf1d582d46c1c913390db3036d756 SHA-1: dae9deda589ff5fad4e321936d3bdcef0d1d6649 SHA-256: 9d28b557e496d4d8f1feca8d2e4d1e36f4fa66ae4ce3278379cd53600e168a4c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, likely for phishing or malware distribution. The document body's metadata about 'footer template bootstrap code' is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/123?utm_term=footer+template+bootstrap+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452837/normal_604421aba43c3.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/figurative_language_dalam_puisi_the_road_not_taken.pdfIn PDF document text
    • http://gomunawuwox.22web.org/parovosesifa.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/is1qgfu/fezoweviwotozitetopez.pdfIn PDF document text
    • http://torchland.xyz/juzogimubemelimatiwuu9vyn.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/ghsaofQ/psp_emulator_pro_mod_apk.pdfIn PDF document text
    • http://vzroslyh.net/derechos_humanos_en_ingles_traducir177s3.pdfIn PDF document text
    • http://thefortykuti.com/652839482574fe9m.pdfIn PDF document text
    • http://xsafak.com/angel_of_mine_monica_freeooy4g.pdfIn PDF document text
    • http://options.expert/shared_mailbox_permissions_reportrlwcw.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/qtjbZE8/26933420465.pdfIn PDF document text
    • http://websporizlehd.com/53253238784oiggq.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/73622746994ardpm.pdfIn PDF document text
    • http://itawegan.fun/adaway_apk_roott2muu.pdfIn PDF document text
    • http://peludofnor.fun/xanathar_s_guide_to_everything_druidb2n8i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_5fd82c73d0889.pdfIn PDF document text
    • http://optarfes.com/1992178619977xx8.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/djgemjj/4744858792.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujogosofeti.epizy.com/40280764912.pdfIn PDF document text
    • http://marivugedada.epizy.com/9327920960.pdfIn PDF document text
    • http://wogenulelo.rf.gd/49928744394.pdfIn PDF document text
    • http://sefokirof.onlinewebshop.net/time_and_attendance_policy.pdfIn PDF document text
    • http://lumalidik.atwebpages.com/scb_annual_report.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/6578859486.pdfIn PDF document text
    • http://dipumekamerara.rf.gd/hitachi_miter_saw_c12rsh_parts.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_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 5312 bytes
SHA-256: af36a25bd57ef3c9ab6c8446cdb476fd087c584beadc7d222c2d1d4e321b7e95
font_01_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 10928 bytes
SHA-256: 69cba734a8b85b735140941ce0ce77d25b32d49a14d017c8a3b5734c81d29c51

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