Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff50417eada75df…

MALICIOUS

PDF

99.4 KB Created: 2021-03-15 21:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8a25eddc878e8dd3e1ef7b644aeddc0e SHA-1: 3df3df40ff333a72dedae6dc1646afe53acb3be5 SHA-256: 4ff50417eada75df46b8f3fa6451c0820ca6a21731aa3f78372758a2d99cb66c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains numerous external URIs, with one prominent URL being `https://jottigo.ru/strik?utm_term=presto+dehydrator+beef+jerky+time`. The PDF also exhibits characteristics of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL usage point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jottigo.ru/strik?utm_term=presto+dehydrator+beef+jerky+time PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379486/normal_601d5958d36b0.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/31671103756.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5fc7a8bc65c06.pdfIn PDF document text
    • http://xizugef.medianewsonline.com/jikofojerer.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/how_to_get_pokemon_crystal_clear.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_604ae097eb796.pdfIn PDF document text
    • http://kebotup.66ghz.com/modern_king_platform_bed_on_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fefdfb6a15be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488335/normal_60005f1459d7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_602d3ffd76a47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pevipitoz.atwebpages.com/jeux_de_cartes_facile_3_joueurs.pdfIn PDF document text
    • http://suzoduw.rf.gd/apprendre_le_franais_en_jouant.pdfIn PDF document text
    • http://xesesezaxemu.epizy.com/24198643743.pdfIn PDF document text
    • http://nivuzujanux.myartsonline.com/ffxi_ninja_solo_leveling_guide.pdfIn PDF document text
    • http://jababonulet.epizy.com/panasonic_inverter_microwave_oven_grill_function.pdfIn PDF document text
    • http://xidujexakarola.rf.gd/how_do_i_fix_my_hp_officejet_pro_8600_printer_failure.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/pobuzodijotesagokowefu.pdfIn PDF document text
    • http://gusubozavagu.epizy.com/andromeda_cracked_apk.pdfIn PDF document text
    • http://mawidinivetobi.myartsonline.com/will_there_be_a_second_season_of_altered_carbon_on_netflix.pdfIn PDF document text
    • http://gepuxaxevo.rf.gd/nimeloniwakag.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 5180 bytes
SHA-256: 95cc1b888d734b5170359264e619ea617fd212fd7d19aa8553aaf6c594b0bc87
font_01_sfnt_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 9600 bytes
SHA-256: 5216f64bf4f995d6b2dde410fe51ba5cefc72900ba751585449dee6d1337dae1
font_02_sfnt_off00012aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEB 11928 bytes
SHA-256: c42479dbc5e30929cd5994703423bbe2d535e26ea1369e29c92f3364de223260
font_03_sfnt_off0001533a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533A 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f
font_04_sfnt_off000167a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
font_05_sfnt_off00017556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17556 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19