Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d37756241b9184…

MALICIOUS

PDF

78.5 KB Created: 2021-03-17 05:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 51bce9efa71d2308ea57797596df4771 SHA-1: a58e09aaab97196a13f7ab2953f7294ec96ac57a SHA-256: f5d37756241b9184d00bac19196f0a3d9d3bc89eefc616970c87e40d01cd163d
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external websites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/wix?keyword=verbal+operants+in+aba PDF link annotation
    • http://tebefomi.22web.org/nokowuvivikenivewegon.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/barney_stinson_bro_code_deutsch.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/anlisis_de_la_carta_a_garca.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/nikinatigixajubesojo.pdfIn PDF document text
    • http://fewutame.getenjoyment.net/great_quotes_of_all_time.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/ansys_fluent_18_tutorial.pdfIn PDF document text
    • http://mowisadewojapu.22web.org/vufiginewared.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/87453040176.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/job_interview_questions_and_answers_for_fresh_graduates_call_center.pdfIn PDF document text
    • http://nuzarekuzugav.mypressonline.com/sonuxotumi.pdfIn PDF document text
    • http://redofokotab.sportsontheweb.net/71690096210.pdfIn PDF document text
    • http://gejurabek.getenjoyment.net/how_to_reset_citizen_navihawk_watch.pdfIn PDF document text
    • http://fedezin.scienceontheweb.net/wenad.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/ge_freezer_is_not_cold_enough.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/86920053556.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wesatume.atwebpages.com/balibe.pdfIn PDF document text
    • http://newubopuga.epizy.com/java_eclipse_ide_for_windows_7.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/tajan.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/99367454041.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/cant_open_my_sentry_safe.pdfIn PDF document text
    • http://desakoda.rf.gd/tolivekinixobinot.pdfIn PDF document text
    • http://tegofiv.epizy.com/cetus_wisp_farming_guide.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/36745570317.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/jofexunupaxobugavawujuwa.pdfIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/evap_line_vs_faint_positive_blue_dye.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_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 4920 bytes
SHA-256: 392be13a6b2be74459d650d283fc2f989418adfc09df31c98bd6b4a5884c4b90
font_01_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 10352 bytes
SHA-256: 84c83e9bf0bad5a0b1a5c744dd89bfce3e73a7b10e00302b5a50cb7a2632faef

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