Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f2017cc348e6ab…

MALICIOUS

PDF

83.4 KB Created: 2021-03-22 18:55:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e254f4dc908a82619e2318516e292864 SHA-1: d1e0b178d92c71165d7417c47607bb28d10b68a5 SHA-256: e0f2017cc348e6ab9b52428dcf13ae6e1a91920d925c783fbb6e8a57a560ef89
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, with one specific URL pointing to a PDF on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/aws?utm_term=bayesian+statistics+r+book
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/nomevokaxifis.pdf
    • http://bunutib.mywebcommunity.org/butcher_shop_equipment_list.pdf
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/ronitejowimevut-xilajaxe-puzefezuxituwe-porokuxugenirup.pdf
    • https://mukafakurud.weebly.com/uploads/1/3/4/3/134315218/4022118.pdf
    • http://sejerodetupumil.medianewsonline.com/business_analytics_courses_edx.pdf
    • http://fozivot.mypressonline.com/addition_and_subtraction_worksheet_for_kindergarten.pdf
    • http://vegifeda.mypressonline.com/sefebasubulusamagide.pdf
    • http://zakomuxoza.getenjoyment.net/jijolarajadoginub.pdf
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/8093416.pdf
    • http://nosilekexiwot.mywebcommunity.org/rurag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vefazuxugog.rf.gd/xukawekevaguredam.pdf
    • http://tifavamifikas.myartsonline.com/how_many_calories_are_in_10_dunkin_donuts_munchkins.pdf
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_0b809bb4c8884af8b0c9c4504aa733b8.pdf?index=true
    • http://geforagegi.atwebpages.com/best_settings_for_mxr_bass_compressor.pdf
    • http://petojijoxura.onlinewebshop.net/pioneer_dxt-2369ub_specs.pdf
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_f25fa63ddfea464887f75c132f4c50d2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/da2ac168-5c05-4a27-a1b4-3c632976bcd0/bersa_thunder_380_cc_laser_sights.pdf
    • https://uploads.strikinglycdn.com/files/33935ab8-ca2a-441c-9cc7-e91cc88fab94/how_to_write_an_introduction_paragraph_about_yourself.pdf
    • https://uploads.strikinglycdn.com/files/7221d911-35c4-4ea7-a55a-1810d7cbc5e7/zepokutamose.pdf
    • http://motuvogipe.onlinewebshop.net/agoraphobia_case_study.pdf
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_c72d62c9326c48a09e51a361c100e1b7.pdf?index=true
    • http://zafebofegev.epizy.com/adobe_premiere_wedding_title_templates_free.pdf
    • https://uploads.strikinglycdn.com/files/4c04b98b-d063-4cb7-ba41-85ab8502372b/99973684850.pdf
    • https://uploads.strikinglycdn.com/files/c21db1ee-15d5-49bc-addf-16e0133f6ddc/functional_anatomy_of_yoga_david_keil_free_download.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_off00010681.bin
e577858c657a971178e258e48dc261a69503dd64f15d9101d23e3b6a38646c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 5116 bytes
font_01_sfnt_off00011804.bin
c38a751242c5593ac02e84a28fbeae9c97773eff458eeddbedd08756a9f9fcb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11804 11744 bytes

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