Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b24c5ffba4968d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 22:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17d1b683a396eb02f91ed71fb0c17ba9 SHA-1: 92efbc029bf507e21205f8657c6a11bfbc2c0232 SHA-256: 90b24c5ffba4968da6c0a754c47dc969cf2c538bbc4822ed0454d5ea872feb0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=shaktimaan+comic+book+pdf+download PDF link annotation
    • https://hssanesteban.cl/files/55274965721.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/welutufozosabak.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613defd3023c0---15391386076.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/takuke.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/kuvudid.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/73482285626.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/95512844084.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/29264292848.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/40673449660.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/60997091147.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/koxupewex.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/622163574.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/muzokudasododexotabimuvof.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/20485804018.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/33819174269.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cg18b0jqv94ivlv4g67i95eq02/riwomafop.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/18536858740.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/vuligufudoditaxatekefi.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/12960565756.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/japanad.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/sasipovujanimaxube.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/xilibawevofabunasaba.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/tizasojegajaxixageporobif.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/6849720071.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_off0000af5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 10880 bytes
SHA-256: 877547c571fdc68b6c4fdb071f89cc630cd1a0f8d41b0e74b67b22c2415aa815
font_02_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 15620 bytes
SHA-256: 6eebfe91b65c43af98517dea94b685aaf45bc5c49871fdda80b1e7e34f14a54e