Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b93ac0aee461ce5…

MALICIOUS

PDF

77.2 KB Created: 2021-04-06 01:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8825857afc55c9d73b35cec41ceb765 SHA-1: 75bbb765d5bdf2538a3097f0f60f3ffc8e91bc74 SHA-256: 3b93ac0aee461ce5cd273be29b69fd4d5d09bc44f13765b1439398a0e2ba86dd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://xezojetit.ru/123?utm_term=biology+corner+mitosis+answers', suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=biology+corner+mitosis+answers
    • http://private-channel.site/jezilapexokovobidorikofos3n5kk.pdf
    • http://madawuboso.sportsontheweb.net/estrategia_empresarial.pdf
    • http://lnstagramsupportinfo.com/90310378916ixhsm.pdf
    • http://datinge.site/greek_play_antigoneeisxa.pdf
    • http://wonder-ita.space/ejemplo_de_proyecto_de_investigacion_educativowpx50.pdf
    • http://kedugobepuged.mywebcommunity.org/87823502210.pdf
    • http://gulenapirexapo.iblogger.org/1471086898.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dabatisew/acoustic_guitar_songs_sheet_music.pdf
    • https://s3.amazonaws.com/wixatax/cara_lagu_free_di_itunes_iphone.pdf
    • https://s3.amazonaws.com/xugigabitulu/what_causes_high_pressure_in_air_conditioning.pdf
    • https://s3.amazonaws.com/lusegokaves/71886467190.pdf
    • http://taberadajip.atwebpages.com/dexuvezibosuk.pdf
    • http://nowuzapifara.rf.gd/citizen_in_the_world_merit_badge_answers.pdf
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_5ee42f5585f94abdb239dd1a162dff3b.pdf?index=true
    • http://dojorunubi.myartsonline.com/zanasiwewuxuvofivi.pdf
    • https://s3.amazonaws.com/mubefula/acretismo_placentario_por_ultrasonido.pdf
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_29bad1e30d3849deb044e6994f45d4d7.pdf?index=true
    • https://s3.amazonaws.com/dikobepibelun/where_is_the_witcher_3_in_the_timeline.pdf
    • https://s3.amazonaws.com/xanunafojuloki/vosujugag.pdf
    • http://fipepazis.epizy.com/school_lab_assistant_interview_questions_and_answers.pdf
    • http://vunonam.atwebpages.com/60330156407.pdf
    • https://s3.amazonaws.com/fajetufekejo/disawisafunafesekebikuzoj.pdf
    • https://s3.amazonaws.com/fujadabez/76210956726.pdf
    • https://s3.amazonaws.com/tinezedu/sasuwovazopumovagufovodo.pdf
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f4.bin
c55df60bc60f94fb92f74322e4dbcfc5e64c16a285fddb6c6776b9c95ba769f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 5148 bytes
font_01_sfnt_off0000f563.bin
a21c1e117cae35ee3a0aff58b3139ab46ae27e121232bbd19f75eb0113367124		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 10684 bytes
font_02_sfnt_off0001196d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 4324 bytes

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