Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea38a681ff1b1a81…

MALICIOUS

PDF

121.9 KB Created: 2021-03-22 16:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5009ffe556001ca6bf9a1725f2f6be99 SHA-1: 57c6f18bfee570056bb519245d4ce43d4533f690 SHA-256: ea38a681ff1b1a81900a035788364fe156b5ff5d8f926e7e2f6d139039b8a260
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://resalured.ru/award?keyword=seirei+tsukai+no+blade+dance+baka+tsuki+pdf PDF link annotation
    • http://topshops.website/paxumoruzesavoduwukonizu0euw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_6052e59e4743d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409799/normal_5fef7f85e73e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_602305ba46ee0.pdfIn PDF document text
    • http://idealica-italiauficiale.website/5_cm_per_second_soundtrackwpz5g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376096/normal_5ffb9e944d603.pdfIn PDF document text
    • http://ogranicbio.space/sudezuwi3ydrw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_5fd63255cf977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454301/normal_6002238a1f444.pdfIn PDF document text
    • http://getcabinets.xyz/taxizollbiw5.pdfIn PDF document text
    • http://wekeb.space/how_to_access_wd_my_cloud_storagek2imc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_47b64cc1baae49caa2fbb82aaff182b5.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_954a5986415546f08fe6c9356cecb2d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/wapizufoxunogazazopodeg.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_633fda68e7b549848a18fc7437bb4f81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takurugilij/astronomy_eric_chaisson.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/70439805766.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_e20527bc997f4ae0875b358234e9e2e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/babul_de_vehre_video_song.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
stream_003_off00015686.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15686 22588 bytes
SHA-256: 76a119bde0306b67eff563d58b3cde370a6c50624e73f21e8518d77773fcc9e9
font_01_sfnt_off00019dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DBD 5456 bytes
SHA-256: da81b7b73213e7fc33c802ce7e770187a5757d40802d74e9b04d18e09bfa2677
font_02_sfnt_off0001b057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B057 12112 bytes
SHA-256: 56301192bb48ed372751bd61932ae7f427836c54d9c5aefd28cd726b29d23a8f

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