Malicious PDF — malware analysis report

Static analysis result for SHA-256 4134693e7f0ece10…

MALICIOUS

PDF

72.6 KB Created: 2021-04-03 19:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: eca59db7b762c6ea270b48fa7c0d889c SHA-1: 5bdf2b7b0068001a86870494a566676829eadc2d SHA-256: 4134693e7f0ece10f943d4e7933c7af33db4276e9ef3c8dd35a767166f1fe6f9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many hosted on disposable domains, suggests a link farm or phishing campaign designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely used as a lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://seumenha.ru/wix?keyword=bloons+pop+unblocked PDF link annotation
    • https://cdn.sqhk.co/posojuvapono/vrAUidi/bizafibixizimisak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369794/normal_6000c9108a9ee.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/ggfCZCp/84445961403.pdfIn PDF document text
    • https://cdn.sqhk.co/vatukaso/8jaQiad/xeneda.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/RhdTGOA/cartoon_wars_blade_offline_mod_apk_free_download.pdfIn PDF document text
    • http://visionnew.xyz/didezoyl2bl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_6023ea043cfbd.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/dgcjcgf/pictoword_level_92_taxi.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/57579964541.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/monthly_calendar_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/yjjkji2/94144566962.pdfIn PDF document text
    • https://cdn.sqhk.co/gixobujikelu/jjhidaH/85386929986.pdfIn PDF document text
    • http://wei-nmvc.com/151121876122vatm.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/bohhHso/63218666955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_605390771b9fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_601bb6a43eb4f.pdfIn PDF document text
    • https://cdn.sqhk.co/gulofiji/hgdSUr0/zugovodirosefe.pdfIn PDF document text
    • http://homiak.fun/66612081265ntems.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/bioethics_in_nursing_book.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/hbsIhjf/72420712471.pdfIn PDF document text
    • http://cartest.pro/que_es_la_educacion_fisica_y_su_importancia_en_la_saludyq69t.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/0dmwibs/download_invasion_modern_empire_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_600c44530e40f.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/hAijjd1/simcity_buildit_cheats_2020_deutsch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xikusaduxofi.atwebpages.com/axis_and_allies_1941_rulebook.pdfIn PDF document text
    • http://zilisidojaze.myartsonline.com/chinese_pinyin_to_english.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_off0000e1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 5012 bytes
SHA-256: 42d941340a13ceaff03430f671d41baafcfb1c66c2b1bec7fa4dfbcd073ce399
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 9876 bytes
SHA-256: f5af23712d16c57247ab6f7e242f56f6fb15c7d179151158be21b7223793b063

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