Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f38c4d1af35b719…

MALICIOUS

PDF

78.0 KB Created: 2021-03-14 08:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 61ea20035f995c14d04ab66735aa68d1 SHA-1: da3d1d0af49473067a0996cdbd332cd70aecc4c7 SHA-256: 0f38c4d1af35b719f3970ec9caa92a2a8b9d6dfc695e9429d7fb78e70deb2c00
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to book searches, directing users to external sites.

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://jottigo.ru/award?keyword=mohamed+benchicou+livres+pdf PDF link annotation
    • http://jekefidaz.mygamesonline.org/jazupujuviwazowib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_600c6a8f6f70b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_6002db1074e9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454047/normal_602fcb5c6273b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_6043889c00dd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480412/normal_60215cea4660b.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/79454378743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_602c486a93a46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fca49356a1cb.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/what_size_needle_do_i_need_for_my_brother_sewing_machine.pdfIn PDF document text
    • http://gebikomuxe.getenjoyment.net/exercice_corrig_algorithme_les_tableaux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nogafojomor.onlinewebshop.net/2nd_grade_math_multiplication_worksheets.pdfIn PDF document text
    • http://nijarigu.onlinewebshop.net/bunariviba.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/life_cycle_9500hr.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/suwasivasilubokoroki.pdfIn PDF document text
    • http://goxafebo.myartsonline.com/26157558958.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/kesuwajuwuvajajibubel.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/louver_design_sheet_metal.pdfIn PDF document text
    • http://dafukip.myartsonline.com/brother_2270dw_setup_mac.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_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 5600 bytes
SHA-256: 3841496057fd638666e2a4f362698d8e1d7099cc9df8982c39978d70287e69af
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 12928 bytes
SHA-256: 2cc6401e12c558a91ebc3b3f2d140388ebcb8e5cfcfe07f027b778bc5ab861bb

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