Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57744c14634c361…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 21:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc1084227760566806772195a47980c8 SHA-1: edf94208edc599ef8347c941060a33990f35dfb4 SHA-256: b57744c14634c3619e6e07564ac92052d64f35d413f815e6cbd4732d5a990cd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and numerous external links are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ballmillfactory.com/d/files/77276268811.pdf In PDF document text
    • http://fu-xin.tw/uploads/files/202109162238305394.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/nabupumilaxijijefumef.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/23859758993.pdfIn PDF document text
    • https://semut73.com/contents/files/mejazularufegu.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/5533242275.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/44569212578.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nafutilemutakazetof.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/nanirovekuzugetebilem.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/55719706272.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/gobov.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/kobakamewufosipuribib.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/zetomofebafozaso.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/52709722985.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/zomutotokit.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109131521273053.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f4e80238---32189471787.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae976d29b2---45921744132.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/xemijokukopiguwijarafewek.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/30741591314.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/togawesutanofepafibazuxu.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/3874629748.pdfIn PDF document text
    • http://someteme.com/archivos/_20210907113623.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/pepugusikomizov.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/sezaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=honey+and+mumford+modelPDF link annotation
    • 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_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 10364 bytes
SHA-256: b89c9df4beacd0eb632821caaea9b532e19fbc08d4007787e9f5f55ae0c1697e
font_02_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 17832 bytes
SHA-256: a4086ecb2695522932f03c17754b685379221110edcb3b76c6154e4cae66f512