Malicious PDF — malware analysis report

Static analysis result for SHA-256 012de2aad966519e…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 01:53:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c29968807d4db3f296b0a5ae7139d85e SHA-1: 2903c247df42161d7a31c4213806b8e0059a1f3f SHA-256: 012de2aad966519e53c991ba30369fbfbd21a75561b78fa028b6f3973ba659c7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'https://zajinet.ru/strik?utm_term=excel+online+courses+australia', which is likely part of a phishing campaign. The document body, though heavily obfuscated, contains keywords related to online courses, reinforcing the phishing lure.

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://zajinet.ru/strik?utm_term=excel+online+courses+australia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481424/normal_5ff62f28635eb.pdfIn PDF document text
    • http://ideal-it.fun/why_is_my_vizio_sound_bar_blinkingonhj4.pdfIn PDF document text
    • http://neojust.ru/99222427185mii87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477408/normal_5fc5d5ad41803.pdfIn PDF document text
    • http://ductsunlimitedins.com/fupotulemujegozejjxht.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5fd9f220caaac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5fd219fe28c29.pdfIn PDF document text
    • http://carbackseat.site/mera_gana_baja_de_song_mingkzzjt.pdfIn PDF document text
    • http://ludshop.xyz/sobovijafavuxezalib78k5v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/2084020830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7189c2-63cc-4d16-975d-ae0f14f17737/10_principales_problemas_de_salud_publica_en_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efdc9ba3-5d8c-4399-b634-5650aa3bd026/71254049095.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/jivifokabafakugopug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f551e44-a24a-41cb-801d-e29f1d3e7bfb/how_to_write_a_persuasive_conclusion_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b578cdf-ebd9-4aa8-8194-5ae88e5ec793/wahl_cordless_trimmer_8900.pdfIn PDF document text
    • http://jeromipaxipuda.rf.gd/kekatibunotubalosivog.pdfIn PDF document text
    • http://vilujemes.rf.gd/fojulebitoranapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bbc3cf1-1d18-4884-875a-763dfaefdcde/notuzode.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_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 4820 bytes
SHA-256: 51df35d80adb94a209e4e959464e397adfa04076b710f3173ed81a53640a20e6
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10700 bytes
SHA-256: 43fe3b7f9186df3bc84eaa21cc252c99cc9ff332bb4c70ab6d93ddb4e5363917

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