Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3afeac5c18e1aa8…

MALICIOUS

PDF

154.5 KB Created: 2021-06-08 01:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 980ec3092cfa31196f4bbf0cd4cc09dc SHA-1: e97d344fc0602c02201bd18072184c8ede10f75c SHA-256: c3afeac5c18e1aa8d1640e1edc5b45ce19d6c2b487a27af99664d4ecac7b540e
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/pbw?utm_term=geometry+quiz+11.1-11.2+answers PDF link annotation
    • https://dubamebaxod.weebly.com/uploads/1/3/4/3/134352749/a115d78d49ac.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/zizedefuruduxikudisi.pdfIn PDF document text
    • https://zimivopup.weebly.com/uploads/1/3/1/3/131381614/zikamikimefokes.pdfIn PDF document text
    • https://bejejedagaf.weebly.com/uploads/1/3/4/8/134862385/d7315d92.pdfIn PDF document text
    • https://waraxisunagigam.weebly.com/uploads/1/3/4/1/134131416/68a23ffc1c593.pdfIn PDF document text
    • https://nurolatu.weebly.com/uploads/1/3/7/5/137505753/9335110.pdfIn PDF document text
    • https://tarimewisu.weebly.com/uploads/1/3/0/7/130739021/mulikenizoga_watatotobu_vigiwunusuru_sitokususobilig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gudikijuruf.pbworks.com/w/file/fetch/144479688/87507121091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ae257d-71bc-4314-96fb-38568ac4391b/longitudes_equivalentes_a_perdidas_de_carga_localizadas_tabla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb84b37c-cfb2-4e70-836f-5a9be365a6b5/tipos_de_fichas_biograficas_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0a264c-4471-43d4-a8a4-c635a776ccf0/sovalimi.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144793869/tudobujiremedojunem.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/rolijulobokuwekosoniwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4442c9a-1e08-47b1-84f5-dad536925800/70926289724.pdfIn PDF document text
    • http://memofemovo.pbworks.com/f/18502635231.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144722076/gokujagidozokejulaba.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/what_is_the_principle_of_iris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16772aeb-44c5-4fbb-a4dc-68d3093042f4/english_speaking_eye_clinic_near_me.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2065D 5448 bytes
SHA-256: 985e10ac1aadef4a8d65f82ae5e77ceab6dcf5afd3a10fff37e8917a76fc819b
font_01_sfnt_off00021902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21902 12976 bytes
SHA-256: b93c65e227519730de0f581e22f0ea3771f4bd58d329bef03bf7a3a2b2d3b9a6
font_02_sfnt_off00024573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24573 16580 bytes
SHA-256: b1300041e3046d2df7405ff296e64037abfee9448195b16c6e341084d8a8698a

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