Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebedd5bf543574dc…

MALICIOUS

PDF

77.6 KB Created: 2021-03-04 15:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 72e2e074e12653a1bc45efe385e0f636 SHA-1: 13adbf90a02def662068edc6d00329efdd7012b2 SHA-256: ebedd5bf543574dc2477a0fb0758385b1d85b6d722c3d81f73fd437b53c5534a
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://xajibur.ru/wix?keyword=skills+worksheet+active+reading+cellular+respiration+answers', are likely used to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to exploit users via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/wix?keyword=skills+worksheet+active+reading+cellular+respiration+answers PDF link annotation
    • http://ferobuxanax.iblogger.org/rekufemav.pdfIn PDF document text
    • http://kipegujodup.getenjoyment.net/3257796145.pdfIn PDF document text
    • http://wamawebikojas.22web.org/cabin_fever_3_movie_free.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/dilemuvi.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/2656368.pdfIn PDF document text
    • https://tabuwesajusa.weebly.com/uploads/1/3/1/8/131856124/2c96efa.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/vitamix_costco_roadshow_canada.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/zapogafonomopod.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/fijavunabudoma.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/EjaXegd/worst_video_game_ever_et.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/83875163799.pdfIn PDF document text
    • http://wobodepubusa.22web.org/50734042301.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/jhaif1g/swatch_sistem51_hodinkee_vintage_84.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/vita_spa_prestige_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/naxaroja/gE0ZgdN/lezodorizonujurufabe.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/caractersticas_de_los_motores_de_corriente_alterna_y_corriente_directa.pdfIn PDF document text
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/nidadarimarogapura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judimavazamo.epizy.com/breaking_news_live_movie_video_song.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_0dce95b037234be89e9079823611b52b.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_e7715a28296f4f538dd818c135c02e40.pdf?index=trueIn PDF document text
    • http://japinoxizidunub.myartsonline.com/34853945740.pdfIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_3c8b7ebd6da5426db73a6cf5c3d579dd.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_5237e0f06fa445c591fc09b830f17f23.pdf?index=trueIn PDF document text
    • http://resilasijajatil.myartsonline.com/why_is_appearance_important_in_an_interview.pdfIn PDF document text
    • http://peledopa.myartsonline.com/what_is_the_default_password_for_spectrum_modem.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_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 5656 bytes
SHA-256: 32dd0f8beba33d0ba369e57479f456daa041dcbac1b4556a25b564632d502b23
font_01_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 10160 bytes
SHA-256: a453dea0bfe31d8ae531c7b87d3456274abd5d51fc242235fe269b4a789a7034