Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd60a56727dcdbc…

MALICIOUS

PDF

68.8 KB Created: 2021-03-19 16:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a403fce194fe2b13991498e7230f23b5 SHA-1: 837c329e56cecc0151e040c915bcf94ef819eccd SHA-256: 7cd60a56727dcdbc98ef7b4eb33a3030b5bb54a44a0c7977cd5d63cd5a65c3ab
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, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate malicious destination. The document body, though heavily obfuscated, contains keywords related to a 'free Catholic Bible for mobile', which is a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/award?keyword=biblia+catolica+pdf+para+celular+gratis
    • http://rufawefojag.sportsontheweb.net/annual_book_astm_standards.pdf
    • https://cdn-cms.f-static.net/uploads/4408704/normal_604934d92bf14.pdf
    • https://tariwina.weebly.com/uploads/1/3/0/7/130739483/rujowiridinufofos.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_6049ecbbd1470.pdf
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/d0e700de.pdf
    • https://static.s123-cdn-static.com/uploads/4426269/normal_5fe15d913544d.pdf
    • http://relibafogat.sportsontheweb.net/business_plan_notes.pdf
    • https://duxegolukazokun.weebly.com/uploads/1/3/1/3/131398215/bazerokatogilowo.pdf
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/papiromiwafijen_xanepupixuw_batafo.pdf
    • http://winokuzovew.iblogger.org/trig_graphs_worksheet_tes.pdf
    • http://xojuxelase.medianewsonline.com/cfa_level_3_curriculum_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lusajafimaneru.myartsonline.com/scarlett_2i4_2nd_gen.pdf
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_7aa8efe3b4ff494da386589b60172938.pdf?index=true
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_2032e9c6582f416faa116c9bb5863dcd.pdf?index=true
    • https://s3.amazonaws.com/lezerawe/58190309102.pdf
    • https://s3.amazonaws.com/papuja/codycross_answers_group_256_puzzle_2.pdf
    • http://lazevemu.epizy.com/united_airlines_flight_information_status.pdf
    • http://zinebozozapi.rf.gd/55992277843.pdf
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_73f7942b316b437db14f149898e2a1d5.pdf?index=true
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_e0b4f4f8065a4373adb98cd1c13926ba.pdf?index=true
    • https://s3.amazonaws.com/fifuto/hyper_light_drifter_starter_guide.pdf
    • http://wugujub.onlinewebshop.net/favizajapuvojujifudi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfcf.bin
91a82709afb54f7397a5e9527acbd4af73d20da7246d8f5ee1cc0aa483fca704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 5512 bytes
font_01_sfnt_off0000e299.bin
cd7a4c4e42cb61981355dc45e3d4190f34c4e494d656b9fb49128404e051ee9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 10676 bytes

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