Malicious PDF — malware analysis report

Static analysis result for SHA-256 4118f541733744db…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 19:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2b4020bb4f6544a2fd75b64c52ed87cb SHA-1: d65a3eba34ca7dc3a73f431eb49931d24209a961 SHA-256: 4118f541733744db973531b17ca48a6f2035cda94874e677f7a23647c436b289
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/award?keyword=campylobacter+jejuni+en+alimentos+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366029/normal_601368fb5f3b9.pdfIn PDF document text
    • http://gesenimul.22web.org/sawukos.pdfIn PDF document text
    • http://limons.space/financial_statement_version_report_in_sap_tcodepirjf.pdfIn PDF document text
    • http://originalhallyu.com/balugemujew3ex1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5fd6a77c2f310.pdfIn PDF document text
    • https://lidukawovov.weebly.com/uploads/1/3/5/3/135323160/juvomuxe_linazagobulu.pdfIn PDF document text
    • http://retys.space/simebiwuwixurefutufavokujeb00r.pdfIn PDF document text
    • http://ruxejup.22web.org/34071743163.pdfIn PDF document text
    • http://faketikus.22web.org/general_knowledge_2019_questions_and_answers.pdfIn PDF document text
    • http://xozapab.22web.org/sebemaxowinasovitab.pdfIn PDF document text
    • http://trikotoria.ru/tapebogomavopidu705p2.pdfIn PDF document text
    • https://talurepif.weebly.com/uploads/1/3/4/6/134603846/bifeper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_604d8bfc6d946.pdfIn PDF document text
    • http://nutopul.22web.org/joposu.pdfIn PDF document text
    • http://fofesivolu.iblogger.org/functional_specification_template_confluence.pdfIn PDF document text
    • http://mpvideo.org/66122887422zdxba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujasanowagug.epizy.com/nakenimipesasijanizi.pdfIn PDF document text
    • http://butexageteril.rf.gd/6522333903.pdfIn PDF document text
    • http://junipom.rf.gd/biological_science_1_2_free.pdfIn PDF document text
    • http://jabizamok.epizy.com/text_message_app_for_android.pdfIn PDF document text
    • http://pidawuz.epizy.com/sisimiwirid.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/film_your_name_live_action.pdfIn PDF document text
    • http://wefulipov.epizy.com/napebaxu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 5524 bytes
SHA-256: 48cbae7badf45459351e1be60f2a2867558fa7c00df00cc723fa31bfe7b00621
font_01_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 11732 bytes
SHA-256: 60838ffe2a05effaac54d9ee1d16a13fcaa3079c4f233cf580302abaadfe518e

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