Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d75a71f0ea6a2f…

MALICIOUS

PDF

40.8 KB Created: 2021-03-20 05:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1dfd3cf8f5f222be8031b640832f7018 SHA-1: bc39edec489fe4e8c996713b9d2c24a50d968cde SHA-256: 51d75a71f0ea6a2fba83e4b0108b81bf604cd846fa90ea77e2a824a8eb5d48f2
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8169

Heuristics 6

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://jottigo.ru/award?keyword=libros+sobre+el+hinduismo+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413977/normal_603847c19fe1d.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/bubejimezixozupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_6035ca8e430de.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenemu/hdibV0H/amino_undertale_espanol_para_pc.pdfIn PDF document text
    • https://panonalosisewe.weebly.com/uploads/1/3/5/3/135316392/sarof_pufixumul_revuborobebu_favazeset.pdfIn PDF document text
    • https://polemezal.weebly.com/uploads/1/3/1/4/131452876/3056048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464534/normal_60290655285c3.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/jetugeridedepe_gelesakevixukej_jixalolewulos_ronoxodiriwod.pdfIn PDF document text
    • http://soruboseveli.iblogger.org/mental_retardation.pdfIn PDF document text
    • https://cdn.sqhk.co/vubiwete/ahdibjc/forest_kingfisher_images.pdfIn PDF document text
    • http://wurijudopala.22web.org/60027041762.pdfIn PDF document text
    • https://jajozopikikaju.weebly.com/uploads/1/3/4/3/134359408/metawigo-kuwasixapupifa.pdfIn PDF document text
    • https://cdn.sqhk.co/vimofufazexe/ijjhjeU/mapudipagujuzovog.pdfIn PDF document text
    • https://devopududifuwet.weebly.com/uploads/1/3/2/6/132696325/dosunapitaguru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_5fe81a8f0c497.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/jfZhi7y/isla_tortuga_san_jose_costa_rica.pdfIn PDF document text
    • https://tobosuxonekid.weebly.com/uploads/1/3/4/4/134493818/zipaxatila.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_0456f996483b43b1b924f43823a6c216.pdf?index=trueIn PDF document text
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_77565e0014ab49f7a9c4647269848b3f.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_fcd234bff67e48a2a0b7804e7b1b47a1.pdf?index=trueIn PDF document text
    • http://romigutik.epizy.com/fidinazoz.pdfIn PDF document text

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