Malicious PDF — malware analysis report

Static analysis result for SHA-256 727a4fbe9ff7d8d6…

MALICIOUS

PDF

86.2 KB Created: 2021-02-15 12:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3ac31e71609d487312881c810b91b5c7 SHA-1: 2e4c2c20f439b9e6a2bcde080d68858521aca7bc SHA-256: 727a4fbe9ff7d8d682f741c7e70b7452d3831aa12883591ae827643bb6c64d4a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a strong intent to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'Dream theory freud summary'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=dream+theory+freud+summary PDF link annotation
    • http://jatamonip.iblogger.org/xiteworutuguwukudogig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450731/normal_5febfbd8a1edb.pdfIn PDF document text
    • http://bokugoso.22web.org/9672612305.pdfIn PDF document text
    • https://jipafevumo.weebly.com/uploads/1/3/1/6/131636956/7545346.pdfIn PDF document text
    • http://blue-tick-central.com/7th_class_english_grammar_book24y7l.pdfIn PDF document text
    • http://sait-ok.ru/thakur_prasad_calendar_august_20207bek2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5feb1cd15e0be.pdfIn PDF document text
    • https://janepaxe.weebly.com/uploads/1/3/4/0/134097288/welodere_vemotabokasegi_zeguke_pidokeni.pdfIn PDF document text
    • http://wolotalute.iblogger.org/guideline_tb_paru.pdfIn PDF document text
    • http://nat-fru.space/audiometria_infantil4ihc5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xamufalifab.epizy.com/repurulagexim.pdfIn PDF document text
    • http://pixudavevenute.rf.gd/sustainability_reporting_philippines_sec.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/gotakexajirolug.pdfIn PDF document text
    • http://kobukapun.epizy.com/pipagodutitubisenow.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/bulldog_francez_blue_informatii.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/telugu_private_album_songs_free.pdfIn PDF document text
    • http://zegeridibedile.rf.gd/baja_autoestima_y_anorexia.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_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 5216 bytes
SHA-256: 8985b9085f7dfc27d5a54a1b65768dfd85ab937e3bd01e8f71b9966e18d1f0d1
font_01_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 11892 bytes
SHA-256: 7df6ae239522165657d4abe8250e981c73077f9f136105193b9848ccf1073e13

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