Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e5c8718f13eb28…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 14:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af106d1e77fbce557f9fb751b5b6652e SHA-1: 32a3ec536f23d25ede6cd3b903ce4378632f4b66 SHA-256: e4e5c8718f13eb28d2f3b05dd242bf718fb22826c2f3698ef427bdce0ee534ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=download+music+player+mp3+player+apk PDF link annotation
    • http://pfmconsulting.org/survey/userfiles/files/viwulujabilawewimipusot.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/34739108168.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/pejemudesolanudawude.pdfIn PDF document text
    • http://www.moyekolodin.com/files/79939512689.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/setatudazofar.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b94563ac81c14a6276b041dc9166ffa7/15211025253.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/97387418097.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/fetopakiv.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/44134042841.pdfIn PDF document text
    • http://praguetransfer.com/files/file/tudilusodesigovejik.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109052159124130.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/51580292229.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/89114690258.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/fepela.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/2994780491.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134704dcf371.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/25435896935.pdfIn PDF document text
    • http://millecolori.it/images/file/toferukewevu.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/duposorumew.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/99682688446.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210907160829473.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/23714654938.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 11144 bytes
SHA-256: 22b53cdf76b8ef7e03696436db564c7f2c360f3feec08ea3a0447b7ea6550a8b
font_01_sfnt_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 17884 bytes
SHA-256: e26035943ce5a0ea8632221f2f862c1535f596386b153f9954de33aac8b482bc
font_02_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1