Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0bb541badc3831…

MALICIOUS

PDF

115.2 KB Created: 2021-03-16 21:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f319d9a8fcc31a2d4865317b70226548 SHA-1: e6efc7e99a3ab5d801a9899ac0b438bf529a92cc SHA-256: ca0bb541badc3831c875e7a6be2214c349aac3bafb4195d1eb30b6c678195d01
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to disposable hosting, and is described as a link farm. The presence of these links suggests the primary intent is to redirect users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vilenefex.ru/strik?utm_term=which+philips+wake+up+light
    • https://cdn.sqhk.co/xafiguzi/bYiitwl/ari_90_day_fiance_music_video.pdf
    • https://cdn.sqhk.co/nufesewepi/gfgj4jb/jevufejulamodagizi.pdf
    • http://worameruvejaka.mywebcommunity.org/90372721674.pdf
    • https://jisenevezapa.weebly.com/uploads/1/3/4/0/134095859/8098562.pdf
    • https://cdn-cms.f-static.net/uploads/4412151/normal_600b6cfa4af94.pdf
    • https://cdn-cms.f-static.net/uploads/4413000/normal_60225e1ab1ab3.pdf
    • http://giwapozolaleg.mypressonline.com/links_awakening_face_shrine_gameboy.pdf
    • http://somixewavado.sportsontheweb.net/romuvizez.pdf
    • https://kigilepoda.weebly.com/uploads/1/3/4/9/134901239/nalibazexomokoj.pdf
    • https://cdn.sqhk.co/rikopekela/jnijEak/retro_speed_boat.pdf
    • http://mimisijuz.mypressonline.com/jomoranumufobab.pdf
    • https://sanofawuvi.weebly.com/uploads/1/3/4/5/134588151/felofoxavepepa.pdf
    • http://mazikopipovix.mywebcommunity.org/50291478462.pdf
    • https://cdn.sqhk.co/ramidazumiko/qhjABPD/fesajusadejika.pdf
    • https://cdn-cms.f-static.net/uploads/4444864/normal_604e448f26361.pdf
    • http://xexapitanegis.getenjoyment.net/97251542850.pdf
    • https://static.s123-cdn-static.com/uploads/4408482/normal_5ff2db5ddd705.pdf
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/tozuvoxob-dikemefu.pdf
    • https://cdn-cms.f-static.net/uploads/4456989/normal_601ac942733c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vexabimumemig.atwebpages.com/conversion_de_llaves_de_pulgadas_a_milimetros.pdf
    • https://uploads.strikinglycdn.com/files/9c6cb24d-db44-45d2-a8b3-f39300130061/percy_jackson_and_the_lightning_thief_book_full.pdf
    • https://uploads.strikinglycdn.com/files/c14c2277-4f61-476d-bbbf-5a32f0d04018/microsoft_office_365_excel_manual.pdf
    • http://vexabimumemig.atwebpages.com/47175433641.pdf
    • https://uploads.strikinglycdn.com/files/f88d321a-d672-491a-866a-68bb77f73824/what_country_is_prince_eric_from_the_little_mermaid.pdf
    • https://uploads.strikinglycdn.com/files/8c8cadd4-3cd9-4b54-bb5e-aab6c5fae5b5/20620728094.pdf
    • https://uploads.strikinglycdn.com/files/9ee123ca-1512-40bd-9e1e-87ed3bb5a617/cuisinart_dcc-1200_coffee_maker_parts_list.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001769a.bin
9b103fc1e2e22076aa1d17077a6d93544c297d2f90c7230e677dd93d5e9b4dc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1769A 4936 bytes
font_01_sfnt_off0001878c.bin
10d681bff4842f06b68811be9af54763ae351afaf999fc20a4b69223238a31b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1878C 11804 bytes
font_02_sfnt_off0001af7c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF7C 4324 bytes

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