Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b955c2feddd1510…

MALICIOUS

PDF

88.6 KB Created: 2021-06-06 03:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b3f7d3b52768c5f70c1aefb318d693f8 SHA-1: 6898818aa972582b4e56d0335c765a6545e14b89 SHA-256: 1b955c2feddd1510fcf749efe75195eeb513806b0e933f993b1d17a00e3dde34
194 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to 'Dangling modifier exercises with answers' and the wkhtmltopdf tool, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/pbw?utm_term=dangling+modifier+exercises+with+answers PDF link annotation
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/vimaja.pdfIn PDF document text
    • https://xuxoxipabixu.weebly.com/uploads/1/3/4/5/134588436/jejuzinolaru_jateteweparaza.pdfIn PDF document text
    • https://pedodexojur.weebly.com/uploads/1/3/0/7/130775447/4410729.pdfIn PDF document text
    • https://gidibaxatum.weebly.com/uploads/1/3/4/8/134889182/fawulifomug.pdfIn PDF document text
    • https://rejowuboxobe.weebly.com/uploads/1/3/2/6/132680789/demawir.pdfIn PDF document text
    • https://kisoxorojapaga.weebly.com/uploads/1/3/7/5/137512046/nufefevonu_gonatupa.pdfIn PDF document text
    • https://nupiwezorebor.weebly.com/uploads/1/3/4/7/134715096/nopufejozo.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/ratumo_jotowoto.pdfIn PDF document text
    • https://rosafuzumago.weebly.com/uploads/1/3/1/8/131857847/fabar.pdfIn PDF document text
    • https://domovogi.weebly.com/uploads/1/3/4/7/134710089/5837809.pdfIn PDF document text
    • https://lumidenozure.weebly.com/uploads/1/3/5/3/135345408/lakisawobumufel.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/8691052.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lerepaxa.pbworks.com/w/file/fetch/144512919/kigilaboganopunumedev.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/how_to_light_a_york_diamond_80_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b693eb08-6dbe-435f-9bd0-2999e5935a32/poxinugaruloxipamesaf.pdfIn PDF document text
    • http://mijatonevu.pbworks.com/f/gta_v5_apk_and_obb_data_download.pdfIn PDF document text
    • http://gozuwef.pbworks.com/f/sanford_guide_2018_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acecc77-ae6b-4623-9ca3-d16de2f8a542/descargar_el_conde_de_montecristo_pelicula_completa_en_espaol_latino_2002.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144413832/76217963152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cba93aa-405e-4ec6-89f5-ee2dadae98a2/99733437121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8cf08b4-0d39-4b88-8f68-f84040d09f6c/manual_de_gramatica_5th_edition.pdfIn PDF document text
    • http://ludagobef.pbworks.com/w/file/fetch/144540117/download_the_fever_code_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc02c1f-181e-4ff7-8e5c-f07a22aba124/installer_des_application_android_sur_iphone.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144558012/detotironudegotasajujum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 5384 bytes
SHA-256: 14f46f215e245dfaf9085e4da8c71e6e6c49b46f8878205eb4868d74031bc227
font_01_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 11876 bytes
SHA-256: 4a3930484c08d882dfef6db826fbe4eb9a134c95627751317604da931f73c282
font_02_sfnt_off000146af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3