Malicious PDF — malware analysis report

Static analysis result for SHA-256 5274b196af17a431…

MALICIOUS

PDF

71.1 KB Created: 2021-03-11 08:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b79c795535bcd0444b3cf47b9d3d4fa7 SHA-1: c2ae9b2f1823fa5aee0de8de6172de8a9071a33e SHA-256: 5274b196af17a43151a58dcd26a673ed4145c495851e6dc7ef84081345e31d4f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing campaign. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier flagging it as malicious further supports this. The embedded URL 'https://zajinet.ru/wix?keyword=wentworth+middle+school+scarborough+maine' is likely part of a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=wentworth+middle+school+scarborough+maine PDF link annotation
    • http://fapepewakidij.22web.org/how_to_charge_merkury_bluetooth_earbuds.pdfIn PDF document text
    • http://nejufez.22web.org/cuantos_metros_mide_una_tarea_de_tierra.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/bgjgggg/arcade_racing_gta_online.pdfIn PDF document text
    • https://pozusope.weebly.com/uploads/1/3/1/4/131453674/5892954.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/WAifidM/download_game_stickman_slayer.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/dKggwFJ/35093406763.pdfIn PDF document text
    • https://lutunorozepilaw.weebly.com/uploads/1/3/1/4/131438778/5036006.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/hbgeidc/yeet_sound_button.pdfIn PDF document text
    • https://dobivevoxopu.weebly.com/uploads/1/3/1/4/131453544/bidelazawi.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/nagev/modal_auxiliary_verbs.pdfIn PDF document text
    • http://dofumuligo.rf.gd/44258807388.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/tigida.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/sapejomurovisiputof.pdfIn PDF document text
    • http://kozitoxezafovi.rf.gd/how_much_does_a_workers_permit_cost_in_nc.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_aea672807b3943b8be606a6ee101673f.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_c3af81d7c38649c8a16efa7e74c503ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suzujewa/9209661345.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/dakubazerirepuxoxumenik.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_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 5596 bytes
SHA-256: d4f0528daf5e1d0c8686c6285096cbab48e83b30743b558e58bb9733447d860d
font_01_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 10424 bytes
SHA-256: c2a119b5328437cd5c5af78c2cc48c066b49cc7cf45edf031704e8559882eec3

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