Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa417cea5ea6687…

MALICIOUS

PDF

87.3 KB Created: 2021-06-07 00:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7268dcce658536afd39fbb0c28aca97c SHA-1: c6b0c9d07397c2c5b7fb0492ca1ae70c2cadf923 SHA-256: 4fa417cea5ea668732d6a1cfe90ce1bfe22c793748739e69ee371a5c471c6b19
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to Weebly-hosted PDF files, indicative of a link farm or SEO poisoning tactic. The primary URL suggests a lure related to 'universe sandbox 2 free alternative'. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing or trojan threat. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/pbw?utm_term=universe+sandbox+2+free+alternative
    • https://foxewazijibaj.weebly.com/uploads/1/3/1/3/131379544/5564645.pdf
    • https://burojexadolej.weebly.com/uploads/1/3/4/1/134108553/bejoxufadukena.pdf
    • https://zuwiliwiwira.weebly.com/uploads/1/3/1/0/131071082/soxiv_tunososizo_sarog_dakikifijo.pdf
    • https://paperozuvupiju.weebly.com/uploads/1/3/4/3/134317912/vetekexona.pdf
    • https://bodovusinorone.weebly.com/uploads/1/3/5/3/135347185/9329252.pdf
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/dukekok_vubidemilekar.pdf
    • https://vixeregipidodig.weebly.com/uploads/1/3/4/5/134592438/bametuwatoxokar.pdf
    • https://visizejafu.weebly.com/uploads/1/3/6/0/136093068/fadawodupozaronupodo.pdf
    • https://vimubuko.weebly.com/uploads/1/3/4/6/134687604/woteg.pdf
    • https://xajobukemuxup.weebly.com/uploads/1/3/5/3/135398270/1580196.pdf
    • https://ligefunodimab.weebly.com/uploads/1/3/1/3/131398292/a1f4e9d239b2.pdf
    • https://loxojugeg.weebly.com/uploads/1/3/4/5/134589710/nalifiti_xuzipisidi_widonikiroxoni.pdf
    • https://sepadobifivak.weebly.com/uploads/1/3/4/6/134612103/690e36ff35c7.pdf
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/3518635.pdf
    • https://lobavasato.weebly.com/uploads/1/3/1/4/131483685/5681734.pdf
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/6548454.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rasovuxosew.pbworks.com/f/simplifying_fractions_puzzle_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/0928a150-df84-4306-a579-304c16f70fd6/44701792435.pdf
    • https://uploads.strikinglycdn.com/files/68a2e58a-051b-42f6-b644-d77c25d6c90e/uncle_arthurs_bedtime_stories.pdf
    • http://xesimisejek.pbworks.com/w/file/fetch/144558816/11718857788.pdf
    • https://uploads.strikinglycdn.com/files/45192445-3519-4387-a57e-249f918c7227/vba_code_read_file.pdf
    • http://sofutikajen.pbworks.com/w/file/fetch/144657921/dell_venue_11_pro_keyboard_not_working.pdf
    • https://uploads.strikinglycdn.com/files/73a3b916-3a33-47ae-b35b-9954c49f1da2/98812437716.pdf
    • https://uploads.strikinglycdn.com/files/b5c7134e-1162-4c23-ace5-2ef22817ceec/activities_for_teaching_positive_psychology.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011829.bin
977d960474679ac45ffc33c16093b725db1dbaa2e3bfd2ca229b5ed04a35c0bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11829 5292 bytes
font_01_sfnt_off00012a42.bin
9da24b7a3fb128cdcaf68ca31ecb12dd3084c351829bed50e10c4da9b0f38e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 10932 bytes

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