Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c93c15d7b5900fa…

MALICIOUS

PDF

82.4 KB Created: 2021-04-30 22:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3b3334cef32164374863431a4486534e SHA-1: 80f6732e00e74cd45bffa8d7cd2d1d63094cbda8 SHA-256: 2c93c15d7b5900fabb2ee96a9ba764252136b5f345db87c315c25d8603a32bfa
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs pointing to disposable domains. The document body, though heavily obfuscated, suggests a lure related to learning English, which is likely a pretext to drive users to these malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a link farm strategy, common in phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=aprender+ingles+cantando+canciones PDF link annotation
    • http://world-wildshop.com/54485934923l8mk3.pdfIn PDF document text
    • http://runibefulamad.22web.org/90529766249.pdfIn PDF document text
    • http://bigno.space/xomipufolosopufoxkd07v.pdfIn PDF document text
    • http://bachanalytics.com/95382457224umuc4.pdfIn PDF document text
    • http://haustova.com/graphic_designer_portfolio_2019z1er8.pdfIn PDF document text
    • http://m-laskin.ru/sex_education_netflix_episode_3_cast9qk1u.pdfIn PDF document text
    • http://voderexu.iblogger.org/wunuteg.pdfIn PDF document text
    • http://axecheat1.xyz/50113024803pp8p.pdfIn PDF document text
    • http://eliyalte.com/91_s10_tail_light_wiring_diagram9pf12.pdfIn PDF document text
    • http://migerov.xyz/tajwid_al-quran_rasm_uthmanifi7pt.pdfIn PDF document text
    • http://leomannapov.com/honeywell_8000_wifi_thermostat_setup1xl2f.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/saxon_advanced_mathematics_test_forms.pdfIn PDF document text
    • http://kapusta.pro/holman_kjv_study_bible_appiywqk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_8adb8a3b296340c2903b6afa35ca0537.pdf?index=trueIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_4273a009d3db4dd7a9de6209e2ff20dc.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_8359d469e2e64315891e176e7c63d990.pdf?index=trueIn PDF document text
    • http://molodetagako.epizy.com/2440229624.pdfIn PDF document text
    • http://nekedejiwaki.epizy.com/93089651227.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_6a71a5aaa9594f8ab25fb805cbb8d7a8.pdf?index=trueIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/nuwovorugurejo.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_029583e19e994fd3a3296139305b67d4.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_459dae6e76454451bf4aef318d4dae2c.pdf?index=trueIn PDF document text
    • http://timerojulawu.myartsonline.com/voropupapefolaji.pdfIn PDF document text
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_0cfc64dc06d14426b055ac393254339d.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_589d7108cbdd49b5823c908be51e045c.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_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 5232 bytes
SHA-256: dba0416afbd55e0c34e429c9fdd2e8f15704fa75a2e1188ab9d5c424f2325952
font_01_sfnt_off000111f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 12504 bytes
SHA-256: 91b4435d4c0ccddccb21ff172c984dda5d57b72105461748c33c7540cd088ba8

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