Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b4860b526ab40b…

MALICIOUS

PDF

80.3 KB Created: 2021-03-28 09:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d6fb07c8d369037eb09831e2c4b9cc93 SHA-1: 79dfb6125ee4bc94519952a701729321d53af6e7 SHA-256: c1b4860b526ab40b1a956ce018770a2df73f710c1a2e682407b0279e6962fba5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a product review, designed to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=is+samsung+galaxy+a10e+a+good+phone PDF link annotation
    • http://lurubalopare.sportsontheweb.net/formulas_anidadas_en_excel_2020.pdfIn PDF document text
    • http://mufajaku.medianewsonline.com/51416158901.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/wewosabupugevalapilunisov.pdfIn PDF document text
    • http://becloud.website/how_to_change_default_user_in_kali_linuxjlzrj.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/sunbeam_heated_mattress_pad-_queen_g9.pdfIn PDF document text
    • http://spiritstudio.ru/honeywell_barcode_scanner_manual089z5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_6048e887a5bda.pdfIn PDF document text
    • http://tronreserve.online/tefemotonewirma3z4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386084/normal_5fe5a84d3ecdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424027/normal_602f88d19eb53.pdfIn PDF document text
    • http://modernstyle.pro/dr_jekyll_and_mr_hyde_movie_2008_streamingb7pdt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377371/normal_60072cbd25d18.pdfIn PDF document text
    • http://freshka.fun/85374818181dawv6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_604eb2b6a771a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_6fc6525327f34280804b58acbadaf46a.pdf?index=trueIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_3e322d243b22492f922b13ef5711f579.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_bbd275bb4a8c418ea969bb412d9ef05f.pdf?index=trueIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_a40502fe49264e72b2d9dcbfce798f38.pdf?index=trueIn PDF document text
    • http://likutolejit.onlinewebshop.net/12850242679.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/generative_adversarial_networks.pdfIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/47602359084.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_32c35883ad594f838391e69edf7cf1f1.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_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 5580 bytes
SHA-256: e8cbcf3156337c7e02b8591ae35d5ec33deede5d78f4d733dc45f0fd8ac03b9e
font_01_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 11604 bytes
SHA-256: 56b98493bfed39c04d74527a66bc7786eb05c7f35e73639e5b21616ff7a00721

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