Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d4ef5e10edbf10…

MALICIOUS

PDF

73.9 KB Created: 2021-03-16 03:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 192043b304ff89ebda745062a82a19d5 SHA-1: 5e737dab92e8a0dcce9e2af9c4b630d3cd93bba6 SHA-256: 64d4ef5e10edbf10b331eeb66c2c9cfc846e38291f8d86400db204a5d0cca72c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/123?utm_term=2+way+relative+frequency+table+worksheet PDF link annotation
    • http://xumupizaxuto.scienceontheweb.net/51411947072.pdfIn PDF document text
    • http://hidver.com/descriptive_writing_examples_gcseap73m.pdfIn PDF document text
    • http://jipolavex.medianewsonline.com/frequently_asked_synonyms_and_antonyms_in_ssc_cgl.pdfIn PDF document text
    • http://idealica-it.website/general_agreement_contract_format3jg1g.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/pricing_and_trading_interest_rate_derivatives_darbyshire.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/daily_words_app.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/model_airplane_news_2020.pdfIn PDF document text
    • http://itsamorem.com/mai_tai_diffords_guidekk7s5.pdfIn PDF document text
    • http://fogafiv.mypressonline.com/write_an_equation_for_the_nth_term_of_the_given_geometric_sequence._5_15_45_..._a.pdfIn PDF document text
    • http://poguzozod.sportsontheweb.net/how_do_you_stretch_your_piriformis_muscle_while_sitting.pdfIn PDF document text
    • http://nesakud.mypressonline.com/tugewefupuvud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_ba5bf6d7225f44be88ef85e395f0aa61.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_a465be016ae94bf8a8147841f6ad1e92.pdf?index=trueIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_0541c2e81ff84c2f9cfb1aa0e174ab9c.pdf?index=trueIn PDF document text
    • http://naxesabefadufu.atwebpages.com/63632573369.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_1b68192b749f4db3abcafe6e67845023.pdf?index=trueIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_fec05704d9ef40bcaf70130b6c2ae7cc.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_1277d8c5817e454aa31d8566bb0f2829.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_85831cd24084478c80eb67e89e8e67c7.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_56b12ad01a6c4f449a00083e698815d6.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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 5588 bytes
SHA-256: f256435e75baaf7f9e8c7e504d64dd362a1a6269cf5726dc2537c50171d8ecac
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 10516 bytes
SHA-256: c557cc78f66658a123fc5384305dfe106e01bb014de2a4d0bb96f313b2d68408