Malicious PDF — malware analysis report

Static analysis result for SHA-256 703c6bee26587eee…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 13:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b668f5aaccecd5ddbef24d6365c8e43f SHA-1: 1710d16d260b1362852387488c69809e00e741b7 SHA-256: 703c6bee26587eee5903a0ec0853ee342c87dfb7ff6167c5c6466b5b02899517
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=america+alone+pdf PDF link annotation
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/fce22e9e8e50f1c1f57e5cca47d06d88/62576127716.pdfIn PDF document text
    • http://ktcz.eu/files/files/69097786338.pdfIn PDF document text
    • https://binhvi.com/upload/files/8806619982.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/luxinix.pdfIn PDF document text
    • http://effektfilm.de/files/file/botiwajagitup.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/13943794593.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/palalamadawuvovofowupido.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/wibabejejama.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d5eba8fe1a10a114a403f7a8af562db0/73789863300.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/buvasokesuwomizogarom.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/58473983864.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/73582074927.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090900585873499.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/83283517673.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/32945110721.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bisurubinetazezijoxuzivi.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/93061612803.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lulaxudapub.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/33583061154.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/jibofalunej.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/18581332964.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/29949942888.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/lubogiritelupuwim.pdfIn PDF document text
    • https://epiphanych.com/images/file/witoputekoz.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_off0000b403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 10496 bytes
SHA-256: 60e27167bc1b6067bf26618aca8ea5a8a57eedbb08465b54f8f907b991dd2fb4
font_02_sfnt_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 16096 bytes
SHA-256: 93428c43b2f0ebdd9b191beaf675d8b334cb65d7bedd00684ad84bd3e1569b62