Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f769edd95ecd011…

MALICIOUS

PDF

80.6 KB Created: 2021-02-25 23:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c9a1b4900989b0b5335de4c47ee683ed SHA-1: 552cba7717ed2b024601da6f5164e5f9e8a1fde2 SHA-256: 1f769edd95ecd0114d821ce9e5a28f05e56205a45bdc098515ec0283c34e5d2f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as academic or informational content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or redirection scheme. ClamAV detection and ML classification confirm maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=james+rachels+the+elements+of+moral+philosophy+9th+edition+pdf PDF link annotation
    • https://zosafetudosejo.weebly.com/uploads/1/3/4/6/134670517/ae1a798268b02c.pdfIn PDF document text
    • https://jabefebilinoke.weebly.com/uploads/1/3/0/7/130739415/jijam.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/sugutazote-vavoxofazilaxo.pdfIn PDF document text
    • http://berozava.iblogger.org/skillet_comatose_album_zip.pdfIn PDF document text
    • https://tafevivif.weebly.com/uploads/1/3/2/6/132682704/vonefufisemogosufaw.pdfIn PDF document text
    • http://kernig.online/jirisujatupanuwopunugu2a5r.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/4455427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://koxowasone.epizy.com/savigefetuvakuvetopefe.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/zowewevesomesikesanil.pdfIn PDF document text
    • http://dulaxidej.epizy.com/ct_scan_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/temperature_conversion_worksheet_answers.pdfIn PDF document text
    • http://samowegepor.rf.gd/zisujuradujatum.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/chop_my_money_video_free.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/jotutogejelijujoli.pdfIn PDF document text
    • http://gikisomu.epizy.com/jasalobunumuzoxamesipupom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 5432 bytes
SHA-256: 8b8c974123fe72480776c83b2de5a02197f205d53cc0e31c089f726130919a42
font_01_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 11008 bytes
SHA-256: 0977bb1c40ea449c8e86d2a296cc5300cc0905de75df2078eb9f2c10b5624613
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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