Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ffd70c75d71783…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 10:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38f0143b80c2b52c7254a41569b6857e SHA-1: 24b851fed9cff460a82da2c6262b450d97041129 SHA-256: c1ffd70c75d71783e3575e5b867d1ba10d746b91831ed407cde0fe1426c886df
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URIs pointing to external websites, many of which are identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=software+per+samsung+galaxy+s2 PDF link annotation
    • https://muacash.com/webroot/img/files/jasip.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/dewarunedelosiz.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/tadaj.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/pufumegetazidela.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/banopezozokires.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e3a00a6e8---46227377845.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/17875946973.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/38998579369.pdfIn PDF document text
    • http://philboyd.com/4664660537.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/gajinopu.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/6480556847.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/towegodifowewuwuvotusoze.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/xivapiwufijaririma.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/miguruvixumimitoseno.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/viroxeribowezubida.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/damagelutow.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141115597c72---5250502712.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d9fa386a2---56333754416.pdfPDF link annotation
    • https://trisyscom.com/userfiles/file/pituz.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/sidabuzeta.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/nopaz.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/bajizozodomutozaz.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/43145634336.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_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 11208 bytes
SHA-256: b2e048598b5b06ba12ff9edd7442967ac3817594b42c77ec4d58982c5232200b
font_01_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 18680 bytes
SHA-256: 567375ab27bb26ad647180b6df07a6a8f47eb7e5825d1896ecd44b92878d1608
font_02_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1