Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc90326e1c01c9f…

MALICIOUS

PDF

79.0 KB Created: 2021-04-19 10:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a51e7f176482c32900a7f16d89a494f6 SHA-1: 4d10917d8feab164250acf46a831546ffbca3649 SHA-256: 3dc90326e1c01c9f16c68f24fe79fb26f02111961f9fedf792688c0f55e84c57
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with several pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution lure. The PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=osi+model+layer+functions+and+protocols PDF link annotation
    • http://erogan-encolumbia.site/jojekdshq1.pdfIn PDF document text
    • http://yesitalia.fun/stick_fight_online_multiplayer_stickman_battlehnvaw.pdfIn PDF document text
    • http://verification-help.business/tarozinjerlf.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/Q1jfshb/tenegimuwegenivugixosusu.pdfIn PDF document text
    • http://copyrightsupport-ig.com/48333104896wchu8.pdfIn PDF document text
    • http://airet.space/guerras_napoleonicas_causas_y_consecuenciassmx3v.pdfIn PDF document text
    • http://salonly.xyz/dama-dmbok_framework_for_data_governance6k8px.pdfIn PDF document text
    • https://cdn.sqhk.co/denobafopum/aU4lngd/88932717149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_6064d25610cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_601dc084544d2.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/icgc2Km/84023955195.pdfIn PDF document text
    • http://hihikane.space/97885957702zc3u7.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/4NNhehe/centris_fcu_locations_omaha_ne.pdfIn PDF document text
    • http://natbeach.space/how_to_remove_iphone_7_activation_locksz02r.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/rogugagatuf/mizag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ffb844-722f-4523-b9c0-bb25a49a8045/parrot_bluetooth_car_kit_fitted.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/la_cellule_animale_et_ses_parties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad67ef3d-ea1b-4dcb-bb8d-588facaa0f5c/cisco_sg200-50p_vlan_configuration.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/99951659609.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/neurological_physiotherapy_assessment_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/basler_be1-_25_relay_manual.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_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 5432 bytes
SHA-256: f068eb40544cf7d04d499367def069344b11127e5669ac92043ae07ade0f9a4d
font_01_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 10504 bytes
SHA-256: 8bbb9ade9834755499308a5cb69cc899a6b66055bf9b55ff26664d594040db36

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