Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b94bde4c90f843…

MALICIOUS

PDF

74.1 KB Created: 2021-02-14 07:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c91c977a24ff828f0a5e5de878553beb SHA-1: 00771e2720e58efe7a5b28060803f08022e955bb SHA-256: 93b94bde4c90f84344d105482e89f3aae8eae33a8d07bf4b8e110ad1a65c6a23
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 link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, likely leading to a second-stage download or credential harvesting.

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://seumenha.ru/aws?utm_term=pool+billiards+pro+game PDF link annotation
    • http://pubgucbayim.com/free_gems_clash_of_clans_2019_no_verificationju5uz.pdfIn PDF document text
    • http://testrun.ru/38435948147njgn8.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/ajggfC9/cabify_app_store.pdfIn PDF document text
    • https://warogowi.weebly.com/uploads/1/3/1/6/131606132/jogegiwuf_lokunopes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fd9ce41e895b.pdfIn PDF document text
    • http://suzenax.22web.org/90662122459.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/162bd0d407f1.pdfIn PDF document text
    • https://nuvomananakoleg.weebly.com/uploads/1/3/1/4/131453817/fokawivole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mizugegixa.epizy.com/allure_report_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/vakaxonof.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/arabic_numbers_worksheet.pdfIn PDF document text
    • http://pisisome.rf.gd/android_sdk_linux_x86.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/sumuwebabasuvixirep.pdfIn PDF document text
    • http://lelurofu.rf.gd/baby_feeding_guide_7_months.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 5020 bytes
SHA-256: 6841bb8c085278d3abe9ff058929ef4cccb8d66cc8083c415d06c1d35efc93d6
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 10296 bytes
SHA-256: b1f7cfa9db43de586ee457b20e52947e60b5093bdc4bdff713b52f4cf9135b94
font_02_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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