Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9679f48d4891d7e…

MALICIOUS

PDF

83.4 KB Created: 2020-11-18 01:35:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: afb5d96c2b42bec8d9b6e726c000eb24 SHA-1: ce298c8b4cf940fb6512eac61a79b642c7d0ab2b SHA-256: e9679f48d4891d7eba9fb4d48c2f98624b2e0e691cdc1bd6c98afba1afcd8cbc
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'cryptic carbohydrates worksheet answers', aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffset.ru/123?utm_term=cryptic+carbohydrates+worksheet+answers PDF link annotation
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/4454167.pdfIn PDF document text
    • https://mikudone.weebly.com/uploads/1/3/4/3/134370159/nanitosamazabipumala.pdfIn PDF document text
    • https://vurazomuloja.weebly.com/uploads/1/3/4/3/134322302/1e3f6dcdb8a.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/82d55f33e13fe.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/puwaborawazinuvijumi.pdfIn PDF document text
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/f504d2cfa786e.pdfIn PDF document text
    • https://zatuduxe.weebly.com/uploads/1/3/4/5/134595584/3565367.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/xakapudakadu/merisoxegemukijevesax.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/gonalipena.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/king_street_primary_school_nurse_job.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/nagifagutugab.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/31563583085.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/xa_trang_trong_foxit_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/winter_2020_anime_calendar.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_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 5432 bytes
SHA-256: 634258c55c61a854478c0b791b98b4174c994d1472982ee47e9a71c7eb1db900
font_01_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 12000 bytes
SHA-256: fd6fc998fe243cc2f8a68a1190b200a2243b646a0b84e2588f33a78da71802d9

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