Malicious PDF — malware analysis report

Static analysis result for SHA-256 797a241fab7c2ddd…

MALICIOUS

PDF

80.8 KB Created: 2021-03-19 15:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b778cf76c859936276229cf917a8fe5b SHA-1: 5b5e2b9ab61aaeebabc2fe14f0ed383afe61aeb8 SHA-256: 797a241fab7c2ddd0fcedde80433dbcb2504344b47afefb7d3f96e0bccfe9d1d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many on disposable hosting, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'caricature photo maker apk' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/123?utm_term=caricature+photo+maker+apk PDF link annotation
    • http://verifybadgesbusiness.com/76686851715gs4l7.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/xatonamunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5fdc8547eceaa.pdfIn PDF document text
    • http://toppiksnack.xyz/musicas_angolanas_2018ya0ms.pdfIn PDF document text
    • http://prizinsta24.space/where_can_i_donate_toys_in_melbourneq3qsi.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/cobra_19_ultra_iii_mods.pdfIn PDF document text
    • http://muzoc.xyz/97.3_the_wave_live_radiojovp7.pdfIn PDF document text
    • http://megatorg.ru/46581834234g7p8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5fea19402ed27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_603feb0f4e859.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/how_does_an_ammonia_refrigeration_system_work.pdfIn PDF document text
    • http://cuzinfo.ru/logic_pro_minimum_requirementspy2wx.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/computer_architecture_a_quantitative_approach_5th_edition_solutions_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393625/normal_5ff3404703742.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/risisipajole/8554264534.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/46713778081.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_b6150d81d45e471fa3f2ee78249cb7b3.pdf?index=trueIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_8dd3390839814087b9469734ff2fa1c0.pdf?index=trueIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_8eb4f6e2fcb04c5fbf36984bdfb29707.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/83587593508.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/how_to_change_resmed_airsense_10_filters.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/apple_store_games.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_59b6c173b6a14eb09c7e8a66df63866a.pdf?index=trueIn 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_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 4932 bytes
SHA-256: dad39a3593511a9011be1f87915159cba876b32f52f1ff9739cb2808a8596c8d
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 11416 bytes
SHA-256: b4edcf883aea08293bcc88c62d56c8044c82849c74b97caab0e02a780415a101

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