Malicious PDF — malware analysis report

Static analysis result for SHA-256 452d3914f3cffb4b…

MALICIOUS

PDF

89.5 KB Created: 2021-03-16 02:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e61f3b751c89c12f05bfc33c7f600309 SHA-1: 900660f31a7da6006a5918d01e0fd61c44217c44 SHA-256: 452d3914f3cffb4bbad5e8494a37184fcc95b8db816d16af7b16c55f90e96014
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

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://seumenha.ru/strik?utm_term=food+safety+net+services+salary
    • http://zefutuwukeras.getenjoyment.net/autobuska_stanica_nis_red_voznje.pdf
    • http://viniveba.mywebcommunity.org/graco_modes_jogger_se_stroller_reviews.pdf
    • https://wegogutez.weebly.com/uploads/1/3/4/3/134310606/22c43b2feb16b7.pdf
    • https://cdn-cms.f-static.net/uploads/4488556/normal_604907a357319.pdf
    • http://peluxuba.sportsontheweb.net/pizzeria_due_a_chicago.pdf
    • http://xafesuvorolivig.scienceontheweb.net/what_is_the_difference_between_crochet_hooks.pdf
    • http://gofadivus.mygamesonline.org/fesedarowatepomedorel.pdf
    • http://finuxezanasa.mygamesonline.org/segment_routing_part_i_download.pdf
    • http://xeresorejal.iblogger.org/ap_chemistry_qualitative_equilibrium_lab_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4467561/normal_60402c7792c70.pdf
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/9842874.pdf
    • http://nizavevorupuj.mywebcommunity.org/filosofia_del_derecho_definicion.pdf
    • https://static.s123-cdn-static.com/uploads/4481397/normal_5ff1bb3455d0f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://geforagegi.atwebpages.com/is_nikon_d5100_a_good_camera_for_beginners.pdf
    • http://merojupamen.epizy.com/smack_that_tamil_remix.pdf
    • http://nibopinalilabaj.onlinewebshop.net/pmd_pro_reviews.pdf
    • http://jimetos.rf.gd/dewalt_dw745_10-inch_table_saw_review.pdf
    • http://merovuditipin.onlinewebshop.net/64109496884.pdf
    • http://penanaras.myartsonline.com/abbyy_transformer_12_full.pdf
    • https://medlineplus.gov/foodsafety.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d07.bin
cde8659a6053a4e14ddfae7b534fc8e26058a5df380c07e3091636bd19d566ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 5132 bytes
font_01_sfnt_off00011ea0.bin
815cfc4964c211430714f24c6c5e389019219218e0ecbe42de9b5c0dfccb9c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 10872 bytes
font_02_sfnt_off00014405.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14405 16060 bytes

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