Malicious PDF — malware analysis report

Static analysis result for SHA-256 72aebec74e150f6a…

MALICIOUS

PDF

74.0 KB Created: 2021-02-13 19:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6e567875a786c5ef7c9c1e1181c16e5e SHA-1: 78fc53a17b8aaa7cd53209ff2095b5e43cc9a8a8 SHA-256: 72aebec74e150f6a044226d64f1a329d0f069ea31d1bf4487534d3255a1606f3
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'critical information literacy skills' to entice users to click on these links. The presence of external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful websites.

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/123?utm_term=critical+information+literacy+skills PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422918/normal_60029a3554450.pdfIn PDF document text
    • http://meriline.store/govovifudfa4.pdfIn PDF document text
    • http://normal-id.com/reversionary_interest_and_remainder_interest_in_a_property6seah.pdfIn PDF document text
    • http://titanovyi-filtr.ru/attestazione_di_conformit_avvocato_modellouz6nu.pdfIn PDF document text
    • http://songkfrk.site/renaissance_periodization_vegan_template_review85cox.pdfIn PDF document text
    • http://itsnat.space/905621965908cxef.pdfIn PDF document text
    • http://wisecreditscore.info/72260337843po64d.pdfIn PDF document text
    • http://stavki.link/tvd_character_quiz_sporclei5n74.pdfIn PDF document text
    • http://gizapiretade.iblogger.org/27057372349.pdfIn PDF document text
    • http://vesibigezedenu.iblogger.org/kabutar_photo_wallpaper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suzibebozodumi.epizy.com/10293197617.pdfIn PDF document text
    • http://savikolapuxol.rf.gd/android_os_for_pc_remix.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/gasoline_material_safety_data_sheet.pdfIn PDF document text
    • http://xakitidopapav.epizy.com/ruxokadotovuw.pdfIn PDF document text
    • http://fogesogorukob.epizy.com/nombre_rationnel.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_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 5100 bytes
SHA-256: 9fde49b9945ed0e08ad15887bc3d76082d07870f0a9b70253274692ae1dcb33f
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 11032 bytes
SHA-256: fb2c4020374a9b4d466e6646d7f05ec32483bc9bc67d7228026068272a2da63a

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