Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13fec1a9ada453f…

MALICIOUS

PDF

97.5 KB Created: 2021-03-20 06:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4ea27df76bcde4b12b4680bfe9858941 SHA-1: 6edd2b89aff0eabbb31cf485a7f92fa76df1a5a6 SHA-256: a13fec1a9ada453f39c05339ed9f2b284ca1b29263729164f5db725bfa938915
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, indicating a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=wordpress+guide+youtube PDF link annotation
    • http://canonsburglake.org/how_to_get_my_onn_earbuds_to_pair2a20n.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ihjfiiD/bottle_flip_3d_flip_itunes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_6015ff3e6b36c.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/fIghNjf/88979788551.pdfIn PDF document text
    • http://cucoupon.info/what_did_the_third_estate_do_in_june_1789wnmlp.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/Jje3hf8/plague_inc_fungus_walkthrough_brutal.pdfIn PDF document text
    • http://nigovaja.iblogger.org/bifuvas.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/if2WTji/gps_navigation_route_finder_direction_road_maps_voice.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/Cgcjbew/rc_buggy_tires.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_60023bed3c6c6.pdfIn PDF document text
    • http://karupumad.22web.org/which_sentence_best_describes_the_theme_of_shooting_an_elephant.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_600f361cb847f.pdfIn PDF document text
    • http://shoop-fl.ru/federlne_granty_na_bvanie_pre_slobjmf4z.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
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_1b803bb4f9ab4500b7a728e2f2f23300.pdf?index=trueIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_468a723c62e245db9ba31c59df11ae69.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_8f1dc3b724054b9799f44e3f947b3cb0.pdf?index=trueIn PDF document text
    • http://lamupogagu.rf.gd/cfa_level_1_practice_exam_schweser.pdfIn PDF document text
    • http://xiburebejevikom.rf.gd/55986599760.pdfIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_cb61a613711d46da9adc9e32dc5a9094.pdf?index=trueIn PDF document text
    • http://jilejulo.epizy.com/building_for_minecraft_pe.pdfIn PDF document text
    • http://kidogip.epizy.com/19145119845.pdfIn PDF document text
    • http://xetumerim.rf.gd/gotedaselajejuzesonu.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 4916 bytes
SHA-256: be91b0e2deb11c597927b03951183eea8c2a8314a7794c6aae27715819d0289b
font_01_sfnt_off0001358b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358B 2972 bytes
SHA-256: 5f867620d0080911b369a9227e0c6bd28149c292fe78bac106086a6989c669d2
font_02_sfnt_off00014121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14121 11628 bytes
SHA-256: 61d78617147bc3bd6a64c22273cef40e31c45d4948f6c717dd92a886c2648547
font_03_sfnt_off000168a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168A6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2