Malicious PDF — malware analysis report

Static analysis result for SHA-256 425bd8fbba1b1a85…

MALICIOUS

PDF

96.1 KB Created: 2021-03-18 05:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 88d186fcf0b3120cffa61b5953c85e94 SHA-1: dbf64e6902cddc84e39cd14209cd87635ad769cb SHA-256: 425bd8fbba1b1a854ba772d97226739aecf388f8388d98bc2be4e2207cfa02a7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were directly extracted, the structure suggests it's designed to lure users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://xezojetit.ru/wix?keyword=second+great+awakening+worksheet+pdf PDF link annotation
    • http://marketes.pro/jajegekomol2r3t5.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/08af13.pdfIn PDF document text
    • http://indital.space/how_do_i_erase_colored_pencil9uvz4.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/35997474330.pdfIn PDF document text
    • http://nulatapukedu.scienceontheweb.net/dilenepiwomiloxerumilurut.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/piwaxoguka.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/xetunejasete.pdfIn PDF document text
    • https://jowujutaxafekul.weebly.com/uploads/1/3/5/3/135348014/2526734.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/32765394599qp7d4.pdfIn PDF document text
    • http://rimarilomikozu.medianewsonline.com/abide_with_me_sheet_music_piano.pdfIn PDF document text
    • http://centerbluebadge.com/schema_de_cablage_interphone_terraneo_5_filsxtott.pdfIn PDF document text
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/41244.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/how_do_i_program_my_uverse_remote.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/3952357.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/xojafemori/82617350209.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_5a9fd4122bf846cbb07e7a55842df735.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b83cbf-0349-4d42-ba0e-0c3d8ffbbbfa/juxutij.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_aabb1f060f64497b8c90b52023f4f0cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/medical_admit_card_2019_bd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1eedf4-cdaa-4555-918c-4dda1defb3be/gusabijorixovuxunemab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b007ad77-d6bb-488e-851e-a0968a96a0fd/zoom_h1n_vs_tascam_dr-05x.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/vewiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f34f313e-b06c-492b-b47a-44ccc3af1b2e/1198569433.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/ada_hypoglycemia_guidelines.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_153dbc3af6b542fa81b1b91e965cccb5.pdf?index=trueIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_ac2c0043e1354e89a92079de1e654d30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/serie_la_biblia_online_gratis.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_off00013bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDC 5644 bytes
SHA-256: d6c748145570a70cd2fe0b1ca5f8fd566d1c443e1dfd8db7eba38d1963a9c039
font_01_sfnt_off00014f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F22 10400 bytes
SHA-256: 7d5754265ec8f498a2412420222fd4a64b615734709094fcaf3413c0e86ad440

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