Malicious PDF — malware analysis report

Static analysis result for SHA-256 0025a412e37cdeb7…

MALICIOUS

PDF

78.0 KB Created: 2021-06-10 18:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2a1c8ef1484fcb8c77cd61616f5cfec0 SHA-1: e6900d5b60d1de82b21981f129c26a0e65d0bd0d SHA-256: 0025a412e37cdeb7f0941ab92c5e01dad0fc96af425e43bdae941acd04a26e85
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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://wastran.ru/pbw?utm_term=ielts+request+letter+sample PDF link annotation
    • https://tobedetileva.weebly.com/uploads/1/3/5/3/135337372/ed93964da8e4c.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/ribimijukesinig.pdfIn PDF document text
    • https://fevolubepekero.weebly.com/uploads/1/3/2/3/132303134/1073506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_6012e76312cce.pdfIn PDF document text
    • https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/8f707e660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_600fee3f34bff.pdfIn PDF document text
    • https://bezakolat.weebly.com/uploads/1/3/4/3/134321390/2955091.pdfIn PDF document text
    • https://pozategon.weebly.com/uploads/1/3/2/6/132695347/7315b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365551/normal_5fc7f932da5dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_6069b793249d5.pdfIn PDF document text
    • https://bifurizikekoson.weebly.com/uploads/1/3/4/6/134690439/911ee73cf09cfd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd89d5f2-f33b-4374-8737-8f7ece7c03c6/lakeremifusalilowu.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144459423/imgenes_de_los_10_mandamientos_de_la_iglesia_catlica.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/nutijetezelusodovupube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b388f7e4-738b-4b47-b8bf-388f07576b99/feng_shui_horoscope_2021_horse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f85092-d586-47f8-8bd4-3ad6bda65859/dyson_ball_animal_2_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80015460-24fb-4ec9-8d19-120198058b3c/83762745406.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/w/file/fetch/144660663/toroputo.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/w/file/fetch/144501741/dupisomonukiribaregamof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07b8331-9427-4909-a24a-6e1baa8d974d/3461369839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d192749-398b-4721-8b61-077d37692999/16712283473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca7de55-91a0-4efd-b06a-293624a74d93/why_dont_students_like_school_uniforms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73322e04-45a0-4efe-b111-ee98bdf9b187/netugegixazovilo.pdfIn PDF document text
    • http://rilewikem.pbworks.com/f/gta_san_andreas_apk_indir_cepde.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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5028 bytes
SHA-256: 6ace21af1071586a38576f13f54e843e37900ad7a6f41202aae7b4b7fcb2d83d
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 2252 bytes
SHA-256: 3f019984cfdfe6c84274c7669782eb41d5b5f4473003a8ae79e5f286dfbd04e2
font_02_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 11140 bytes
SHA-256: 905f409e9e83c5560e85b125b325a554880887fea857d92df6a0ecb89054fc2b

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