Malicious PDF — malware analysis report

Static analysis result for SHA-256 c947e757c023a5ba…

MALICIOUS

PDF

81.1 KB Created: 2021-03-16 08:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c7e140adf2461f8d7c5d8c15fe112a3 SHA-1: e57070ac8161d29d75c4e8c924c2c6e03adad209 SHA-256: c947e757c023a5ba42e5b434368c063794b69104691fe775b36924d030c4c5f0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution attempt. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings point towards an attack pattern involving the redirection of users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=star+template+with+lines
    • http://dokumenty-kiev.online/motorola_mag_one_bpr40_programming_softwarefx3gq.pdf
    • http://mumopajikex.mygamesonline.org/curso_basico_de_ingles_para_nios.pdf
    • http://xazonojader.mywebcommunity.org/62903149810.pdf
    • http://braco.ru/56357495859uwhkv.pdf
    • http://copyright-central-media.com/finite_element_analysis_package_ansys5ltdg.pdf
    • http://makeyourself.xyz/52180478214twq53.pdf
    • http://gekifek.scienceontheweb.net/basic_ielts_speaking_free_download.pdf
    • http://fuxutigox.mypressonline.com/rifenepujabikizegi.pdf
    • http://atomyimperial.ru/airserver_full_for_macz84a2.pdf
    • http://tronreserve.online/impressora_hp_laserjet_3015_manual36sib.pdf
    • http://esclick.pro/wizard_of_oz_bookci5n6.pdf
    • http://cafe-cok.ru/6194619300167unn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xolavozezimodan.onlinewebshop.net/what_are_the_requirements_to_join_the_navy.pdf
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_88123bae5d5641849b32db3af6941f78.pdf?index=true
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_bf705caebf0e4e16a829fc6f03f526bb.pdf?index=true
    • http://gunerepulesin.rf.gd/vilafogipetipip.pdf
    • http://muvipej.atwebpages.com/business_intelligence_course_outline.pdf
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_561d4014ed3d4d6683546f6dfcad0c90.pdf?index=true
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_52e313f1cfcb4d70b795b7cbe46ce772.pdf?index=true
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_e46c64bfa61846e4a2097b39b1de0b7e.pdf?index=true
    • http://namutogenasokab.epizy.com/linear_equation_graphs_a_answers.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_off0000ff10.bin
9adac006bfde56d247f2c3e6b1cc0667473d62ff0704281016218cf221c3863d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 5256 bytes
font_01_sfnt_off000110ce.bin
86337abd75b2b7fffc622e4c49468fa218a402bb9911248319643f651e477af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 11352 bytes

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