Malicious PDF — malware analysis report

Static analysis result for SHA-256 31303ac0d2bc5418…

MALICIOUS

PDF

77.3 KB Created: 2021-05-10 04:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 59522c39d6401c3c7cda04d415b4f2f0 SHA-1: 5ac6b1e853102a80cbde564d08ceb3c9579786d9 SHA-256: 31303ac0d2bc54184f6c8be747c860f72dd79bccb0246a2b8f5929833bebdea0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/strik?utm_term=fundamentals+of+industrial+hygiene+5th+edition PDF link annotation
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/kajirigobutazi.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/niwinezosoge.pdfIn PDF document text
    • http://xaduwojitodefo.66ghz.com/engineering_mathematics_by_ka_stroud_5th_edition.pdfIn PDF document text
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/vafuxukavebexoloxa.pdfIn PDF document text
    • https://rolurenogilu.weebly.com/uploads/1/3/4/0/134096536/nowad.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/mufiw.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/hgfheO5/45742481399.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/hbhjbcm/107279713.pdfIn PDF document text
    • https://tokegomobox.weebly.com/uploads/1/3/4/3/134314144/xigozefox-ziruj.pdfIn PDF document text
    • http://wixedorozed.iblogger.org/ielts_reading_score_calculator.pdfIn PDF document text
    • http://dajobod.getenjoyment.net/arduino_tutorials_point_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://runesufosufej.rf.gd/sentence_combining_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc94de1-b70f-4ecf-b446-11262fc1c785/can_you_make_a_free_wordpress_website.pdfIn PDF document text
    • http://gifazewuki.epizy.com/android_19_release_date.pdfIn PDF document text
    • http://sitasobesageku.epizy.com/navigators_of_dune.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/ecological_engineering_principles_and_practice.pdfIn PDF document text
    • http://xumozokuzutibuk.epizy.com/alimentos_que_inhiben_la_absorcion_del_hierro.pdfIn PDF document text
    • http://kigokigaruv.myartsonline.com/17577663876.pdfIn PDF document text
    • http://sumidemeg.epizy.com/29250477402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f4f514-473f-4c9f-807b-23c9ae31a197/how_do_i_correct_my_location_on_google_maps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd38311e-15dd-45ec-b0f1-719588d5a652/how_to_find_free_books_on_ibooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/590678c3-3a0d-4edc-aaef-f5172c20be4f/27680760837.pdfIn PDF document text
    • http://tegewixu.epizy.com/iata_airline_codes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 5500 bytes
SHA-256: a7515816f4fb6209f6d8e2a1cdb06d36245882fd0c699112902f48778abd8959
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 10888 bytes
SHA-256: 3b176b9deb115aa67bf5c877e8b86791f1ca86dfabb4a2782a76c6f2fd6e8f19

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