Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7aa0887895966f1…

MALICIOUS

PDF

134.0 KB Created: 2021-04-24 00:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 97c5b20a3c5c233865623b6c35451d8f SHA-1: afb6c700e6d4a295f0d1226c5fd87c653817d4b2 SHA-256: f7aa0887895966f1a3e82a8b2140a0c47522d0cd8167b8ecf06f21989b441d0d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, with one prominent URL pointing to a potential phishing or malware distribution site. The document body, though heavily obfuscated, contains text suggesting a lure related to educational scripts, which is likely a pretext to drive users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://gimoguvi.ru/strik?utm_term=grease+script+for+primary+schools PDF link annotation
    • http://bafiselavanebep.mywebcommunity.org/fl_studio_12_free_download_64_bit_mobile.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/fipin.pdfIn PDF document text
    • http://detozube.scienceontheweb.net/careless_whisper_easy_piano_sheet_music.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/93217143725.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/xulewakorov.pdfIn PDF document text
    • http://kegetisa.mygamesonline.org/topizekotaxawimejevip.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/cell_membrane_potential.pdfIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_0211a5bd667048b0987807ad7ea4ecde.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/printable_battleship_game.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/bollywood_video_song_2017_free.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_9a667723063a4481919423372980c05c.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_1cbea8cc9da74d8b9f0794c849f5a038.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_78aeae30f0414af4babe2a93f55d273e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/french_present_tense_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/lesevomuwojalanunufumif.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/karejuxafetu.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/brooklyn_tech_majors.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/kusamemapotis.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_1722d4b724cb421db989986f92b9f054.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_d7acf2e3194e41afa1d2ca0f2d0a1d00.pdf?index=trueIn 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_off0001d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1EE 5388 bytes
SHA-256: fa13f9400c06baacbd55cabee137c73a9c27441dfd45f1052ef6606521de1b68
font_01_sfnt_off0001e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E422 11376 bytes
SHA-256: a4f937212f55659aecab7d3e32b454075e78f23d05c41897315861f242260b24

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