Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d6afb9be02a2c9…

MALICIOUS

PDF

92.9 KB Created: 2021-09-22 17:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 148a49403793f7a7de767aad32078e75 SHA-1: c3d466145c161575674531ce52ae75358cba9259 SHA-256: 84d6afb9be02a2c9e5969d20cae6d143d312791ac0cfa04300e36ea35874ab44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://aynispirit.nl/userfiles/file/jifovino.pdf In PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/jokubaledezubowosib.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311ecd06807---25322638997.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161496ddad8b96---lekanowuvifokiku.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/rajugute.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/jebemite.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/kewapewu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/bukemijariloz.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/xupafofivok.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/3517365318.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/13/file/20210913_005841_137.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/bezowipixujabele.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/89592951743.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/totowaxikevavilex.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/vufuzero.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/demilegubuwira.pdfIn PDF document text
    • http://slsnn.ru/content/file/rudowurek.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/75521577400.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/88469451665.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/3006053364.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/27367996764.pdfIn PDF document text
    • http://matemotors.com/userfiles/file/43718221342.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/luxabijowojeruremeje.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/73429374611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=beautiful+themes+for+androidPDF 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_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 18808 bytes
SHA-256: 63c23e9ddb34c3081504e10401ff427c48ee52582fb28c0cd8bf52df175316c0
font_01_sfnt_off0001355b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D72 10772 bytes
SHA-256: d168ebe656890b705664cd879be1e02aec01198c3774b4016b198fb4f8e01242