Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcdf8525bc180ce…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 14:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5d618ce4c11ab292fd3219504910c11 SHA-1: def519622c01c9c989777e5957ca0b1b237a8310 SHA-256: 3bcdf8525bc180ce3053e817288242ab7fca879a9a86ebcb2e1906cfbe010e4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host numerous links on disposable domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=audible+app+crashing+2021+android PDF link annotation
    • http://alles-vom-schreiner.de/userfiles/file/rojezazig.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/vapamojuzematowemoz.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/vunosez.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/golezag.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210911_D9CE82345B523077.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/83477906947.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/dogegekaditexijazuturitun.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354d427d225---2172728146.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/mozutuwatafolenujerekajif.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/90032103880.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/jutosevotemakewakori.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2c4ea1e3223828c929a491266c73fdea/bujewu.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/guverugil.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/83411884743.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/99544502165.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/rodanojumodoxokurekatabe.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/dolanadenupozaw.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/27242896851.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mikowosefaxizenazusawoxe.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/56922174643.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_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 11208 bytes
SHA-256: e87289187e7941036284648779f545c26857b70ea11f4794ce8ee8a7eaa86ad7
font_02_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 17588 bytes
SHA-256: d996a5c4105fd8a058f2a7b4dbc1d10ceb3fe5b750758319409c09609a781bf1

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