Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eaba3b13162c7d…

MALICIOUS

PDF

82.2 KB Created: 2021-03-22 23:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0fb49d3a6920dea62bfbec20f9735a27 SHA-1: 965b79fc2de3014296ee7956b16f374f5f00caf3 SHA-256: f5eaba3b13162c7d7beff569fd16ed47deb2bb5686ee6a38c27ed89b2ffba9a3
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent URL, 'https://midufefew.ru/award?keyword=bonos+de+carbono+peru+pdf', which is likely the primary lure. The document body, though heavily obfuscated, suggests a theme related to 'bonos de carbono peru pdf', indicating a potential phishing pretext. The presence of embedded URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=bonos+de+carbono+peru+pdf PDF link annotation
    • http://widalatipuna.22web.org/video_online_through_url.pdfIn PDF document text
    • http://bamupiwabibajew.mywebcommunity.org/sharepoint_2013_cumulative_update_september_2020.pdfIn PDF document text
    • http://numidib.22web.org/bofabu.pdfIn PDF document text
    • http://dipugipedanam.sportsontheweb.net/immunization_in_pregnancy.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/xupozurimumeba.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/analiticka_hemija_knjiga.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/niresewigonakerigonirene.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/kannada_nursery_rhymes_lyrics.pdfIn PDF document text
    • http://xemopubuga.iblogger.org/xemisinibixurepet.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/calories_in_dunkin_donuts_irish_creme_coffee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limuzer.atwebpages.com/wamiropuwujafolemipux.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/bizikarenelajabebibiw.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_ff55fae416214da6bf7b43df6cb14b13.pdf?index=trueIn PDF document text
    • http://toloruware.rf.gd/xonofinab.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_5ecea767e0b941019296f2647e2141b7.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_b0fb5f9904c8468db771cef555f923f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwosil/how_to_calculate_transformer_rating_in_mva.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_778b01e60e1d45f185299f6ca43447a2.pdf?index=trueIn PDF document text
    • http://tiwemevi.rf.gd/96070977061.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/atresia_duodenal_neonatal.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/dd_2nd_edition_classes.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_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 5308 bytes
SHA-256: 1971b3c31f07bb3ce53661eb37c10c45c7581b98566b376853b194eb26368874
font_01_sfnt_off00011128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 12616 bytes
SHA-256: 62ab600d801165b0719ab61267ed9b70fc1e190d181265c8aff9e861bcafb821

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