Malicious PDF — malware analysis report

Static analysis result for SHA-256 a945c62aea5d0da5…

MALICIOUS

PDF

74.3 KB Created: 2021-03-12 07:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e8177fe38034102ecac2ba70ecbcff35 SHA-1: 517f14fce377d3c60ee4f97c89ed43848bef086e SHA-256: a945c62aea5d0da561276ef5445ffc306834d711cf2ceff822c773a8abb4eec4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing by presenting a lure related to 'bandhan bank fd rates'. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious URLs.

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://druttle.ru/award?keyword=bandhan+bank+fd+rates+pdf PDF link annotation
    • http://pigigozoruda.mypressonline.com/how_to_add_songs_to_eclipse_mp3_player.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/Yhhx3gd/dijaxuzizapobo.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/gufozeperaladolufazebepat.pdfIn PDF document text
    • https://cdn.sqhk.co/konanetufuda/diaU1Zg/72877663047.pdfIn PDF document text
    • http://terazelidokit.22web.org/ginakadojegojazijivewo.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/42654878090.pdfIn PDF document text
    • https://cdn.sqhk.co/surudije/bjctUje/tuzojivavudufezuli.pdfIn PDF document text
    • https://cdn.sqhk.co/mezewimaxus/ihJhdCu/61334919991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapirexazi.onlinewebshop.net/kewepukujoxorekawe.pdfIn PDF document text
    • http://wenares.myartsonline.com/shimano_dura_ace_di2_manual_dansk.pdfIn PDF document text
    • http://kudadurazeze.rf.gd/farmall_super_av.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/pharmacology_for_nursing_care_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3cbc12b-9ccd-402b-9b12-c76d7e41bbc8/where_do_daphnia_live.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/bissell_powerforce_helix_rewind_belt.pdfIn PDF document text
    • http://mokupimi.epizy.com/20970080598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532820a9-9fd1-489a-bbe7-1000f0e41504/52693266545.pdfIn PDF document text
    • http://jamenajiko.myartsonline.com/sagevesilenimanemuzoxiji.pdfIn PDF document text
    • http://wobadumiravolu.atwebpages.com/jbl_flip_5_stereo_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83ba80c-8e7d-46ef-bdf3-e3be1572e08c/jenesukuvizuwalonubu.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_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 5348 bytes
SHA-256: 35e44d7c19ff40506ebf8184148bd3db486995e2f07732093049479a0bbfa36e
font_01_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 10240 bytes
SHA-256: 05e540249c21a07f4feeb2e56fafd0aca8ebd0b0070e1721b4d507218d696b62

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