Malicious PDF — malware analysis report

Static analysis result for SHA-256 a790a8b07c1df293…

MALICIOUS

PDF

78.6 KB Created: 2021-02-22 03:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c573094c5a8dfa4f78cfb3818e32b549 SHA-1: 6e98298de7e7e6e3deab1a2997608968aabaee89 SHA-256: a790a8b07c1df2937170606a90b2f9e4771c809e2f72797e7f0d453a4d1d11e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to contain keywords related to technical queries, likely a lure to disguise the malicious intent.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=oracle+sql+set+date+format+in+query PDF link annotation
    • https://zupufirelerige.weebly.com/uploads/1/3/0/9/130969681/be055cec4025.pdfIn PDF document text
    • https://fojugifobuko.weebly.com/uploads/1/3/5/3/135328464/e06a3ae52872.pdfIn PDF document text
    • https://makumagem.weebly.com/uploads/1/3/4/3/134373862/3837106.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/jeNIwhh/dunwoody_umc_organ.pdfIn PDF document text
    • http://coloradocustomelectric.com/68893392107zu3u0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_6028f1e1ab358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391000/normal_5fc7c71b3c180.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/Li28hdE/rekevezavajarijutupap.pdfIn PDF document text
    • http://triple-doska1.club/avatar_the_last_airbender_the_rise_otnq71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454162/normal_5fced23c3e84b.pdfIn PDF document text
    • http://magnetfix.store/biomagnetismo_medico_dr_goizqw9uq.pdfIn PDF document text
    • http://mamajan.space/pediatric_surviving_sepsis_guidelinesphbrm.pdfIn PDF document text
    • http://kyhni.site/low_blood_pressure_range_pregnancyqylqh.pdfIn PDF document text
    • https://mepubigavij.weebly.com/uploads/1/3/4/5/134599646/b596a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 5424 bytes
SHA-256: d0f1b26738124b401d2df64becc05749a4b90b17fad28dbe22bba5254a8d9abe
font_01_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 11036 bytes
SHA-256: e8f79d37d516b583402bcdfc2c1a869c710e1e57dcd63d43edfb3a97410e0642

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