Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a635ce0c2126ae2…

MALICIOUS

PDF

67.0 KB Created: 2021-02-19 03:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 47b4c5695b4a8708c3f32c9bc45f2d2e SHA-1: e0f48da26050d3b399a7764ed6d56e8abef7d529 SHA-256: 1a635ce0c2126ae24e5b33eafc36f333b8c4918752c8024a371e587f46efff36
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specifically uses a 'utm_term' redirector, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. While no scripts were extracted, the heuristic firings and URL analysis point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=how+to+turn+off+afterglow+controller+switch PDF link annotation
    • http://datingdate.site/java_jdk_32_bit_windows_8._1q9gep.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/sosigapatezifo-befogunamo.pdfIn PDF document text
    • http://zuwalirakodu.22web.org/46934535638.pdfIn PDF document text
    • http://gedawuxofawu.iblogger.org/gawerovedokow.pdfIn PDF document text
    • http://dragonflysagewellness.com/81754101400clgr7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5fc7cd6a75243.pdfIn PDF document text
    • http://semengergel.ru/gta_5_crack_all_missing_files_downlouknxc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_5fd8ae77486d2.pdfIn PDF document text
    • http://instup.xyz/973877993712s7s3.pdfIn PDF document text
    • http://online-bestshop.xyz/fadukarasekuraxetetukf1x2e.pdfIn PDF document text
    • http://anyita.space/76083265772k5e03.pdfIn PDF document text
    • http://cetop.xyz/ledamobixudinevimow0pagb.pdfIn PDF document text
    • https://rofujerejikuf.weebly.com/uploads/1/3/5/3/135388349/vijinebuduju_rixonolatozipul_vowomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_5fe7d8357ab55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joposib.rf.gd/whats_in_chick_fil_a_superfood_salad.pdfIn PDF document text
    • http://sojidalome.rf.gd/danoxafux.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_off0000caa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 5196 bytes
SHA-256: 77607e95f4d6d5bfe43e08a823c8d98d86b5b85a9f91edeedaca19bf829ffdbf
font_01_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 10176 bytes
SHA-256: 13b74b56fd8542f1940c9db518e846f1444ec54010e4ae24ba2fc6bdd964ea7d

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