Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c11464b50d2448…

MALICIOUS

PDF

73.2 KB Created: 2021-02-16 19:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f41bda9d3fac698af6973542a5b9fecf SHA-1: 94fb9224be3242dbbebbd6979eef762bdb4e19d9 SHA-256: 18c11464b50d2448fce1d353716ef812a8263d291ab865d720d8517731bed7d0
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm used for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a precursor to delivering a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jottigo.ru/123?utm_term=jupyter+notebook+to+pdf+without+latex PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485927/normal_5fd9968203480.pdfIn PDF document text
    • https://cdn.sqhk.co/wudenedu/cVhdjid/us_stickman_army_rope_hero_gangster_crime_movies.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/7834966.pdfIn PDF document text
    • https://mitafomanamo.weebly.com/uploads/1/3/0/9/130969747/loxof_taxupija.pdfIn PDF document text
    • https://lokugejepotag.weebly.com/uploads/1/3/4/3/134318746/fekitagotufuj.pdfIn PDF document text
    • https://xonutupusuvulin.weebly.com/uploads/1/3/1/8/131871786/2633648.pdfIn PDF document text
    • https://sotivozorome.weebly.com/uploads/1/3/4/7/134733800/13cdfe9f497.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/b5dcfa3de66b6ee.pdfIn PDF document text
    • https://satalediveli.weebly.com/uploads/1/3/4/0/134018026/265cfd7188.pdfIn PDF document text
    • https://mobonojijokatu.weebly.com/uploads/1/3/4/3/134320628/745484.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/KgfYohb/76031768408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5fc6b59b83b51.pdfIn PDF document text
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/zutejoruwegiv_fipakape_molejavawagowi_noman.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5fc57e226107d.pdfIn PDF document text
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/6da518f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/free_template_html5.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/outlook_email_form_template_2016.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 5408 bytes
SHA-256: 6e4da566adde9b10f1c635ec06a8d3a3bcc6631a0c2ef5f43b5e36cda34e0414
font_01_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 12176 bytes
SHA-256: 61b8a60eadf6b8249b3fddd73296cff23176096415aaa7fd3bd1416a9b4b4730

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