Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa18b53d686cde8…

MALICIOUS

PDF

81.6 KB Created: 2021-01-19 05:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 511ed4499ece287c1c17d98a93a6868e SHA-1: e9ddb0c0927216ae55a1e73b92dae63a329ea9f6 SHA-256: 5aa18b53d686cde890fd49f11b897c7569720d755a8293f0c60be1ad4595d053
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://bologen.ru/123?utm_term=tre+uomini+e+una+gamba+streaming+altadefinizione PDF link annotation
    • https://site-1168171.mozfiles.com/files/1168171/kidijarunisogoxi.pdfIn PDF document text
    • https://site-1174029.mozfiles.com/files/1174029/structure_of_human_brain.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/TvIZLc3/pandemic_legacy_season_2_companion.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/fktOhcS/trap_adventure_3_apk_mod.pdfIn PDF document text
    • https://site-1178022.mozfiles.com/files/1178022/76313731468.pdfIn PDF document text
    • http://damodudajipofem.22web.org/4270389499.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/gYv6hda/jukaduk.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/j1hiig2/90492128581.pdfIn PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/zorubogavulutogorelab.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/hjZAhaX/school_business_administrator_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/gicahdB/vizimofefijawi.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/2FWbDZL/can_you_escape_6_level_47.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/posufij/11044669028.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/nasavaparawunakowetus.pdfIn PDF document text
    • http://roparewuna.rf.gd/mitemifevax.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/suwazad.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/gapolegubezowifedekuri.pdfIn PDF document text
    • http://kofupugixujodin.epizy.com/3d_audio_converter_app.pdfIn PDF document text
    • http://kazaxese.epizy.com/5._snf_blme_ilemi_testleri.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/44270246053.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/rattlesnake_imdb_parents_guide.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_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 5368 bytes
SHA-256: 2e2c522052be9d243cc73a012c487993494df5d440830a73617984f3aad038e7
font_01_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 14500 bytes
SHA-256: 5586f904b1de709f7fac6175ba8ff54a609f80e8f0a89a683c9e9b699edb7918

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