Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e6fe3c786febf4…

MALICIOUS

PDF

78.9 KB Created: 2021-10-06 01:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3ce0f78992c4ea7db5d28e1262860a8 SHA-1: 3a97e2c16d0bc66637d39d0b58565352c06b5980 SHA-256: c8e6fe3c786febf4231d445ce5a8ca95251078c8d991d12a794fb05d52b6977e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to execute malicious actions or redirect users. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, strongly suggests a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://riwg.in/userfiles/file/33085329935.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143cfcdce640---piguzelokubudoji.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/93610636198.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210929124923.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9svqaqadr1qi6l98t1fdufr4dv/wopudifijefot.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905122400417820.pdfIn PDF document text
    • http://changzhou.chinatupai.com/web/js/ckfinder/userfiles/files/82514000717.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/18129727365.pdfIn PDF document text
    • https://novitas.ro/files/5012751792.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/33530775279.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/84447677033.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/14360418537.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/59590030022.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec15c8db6---4236692644.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/89615451653.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/68020956456.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/xazinefizimoratibe.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/lilijarobogamuvo.pdfIn PDF document text
    • https://tanvietnamdinh.com/uploads/files/33981120784.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/wolanuzem.pdfIn PDF document text
    • https://signika.pl/Upload/file/33151388559.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/fedamodasunenafakar.pdfIn PDF document text
    • http://szpk.hu/_user/file/vufovamaledu.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/15253476959.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/nuwemul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sprained+ankle+exercisesPDF 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_off0000d1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 10556 bytes
SHA-256: 85f70577219e7a0a2bbd81731ed0ddff934336c6c1320fc38b8adea2a3298962
font_02_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 17220 bytes
SHA-256: 48d4bfe66e67737f4d34ed7dce201a8b7b25f661d98f83053eb067107bac7a49