Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f9259b861e1e88…

MALICIOUS

PDF

105.1 KB Created: 2021-09-16 03:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb7b229aa1606eb69997fe9f390b6d37 SHA-1: 7cc9e45546148720a54b9c9c9c880bbf1ce39041 SHA-256: 38f9259b861e1e88b3aedf9948ca9db1eb1012df4dab61badf7296d89bee3b32
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests the document's purpose is to host numerous links on disposable domains, likely for distributing malware or phishing. The presence of embedded URLs further supports this, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=how+to+hack+wifi+password+in+malayalam PDF link annotation
    • http://avatars.ru/userfiles/file/kezevumovisalupiwataj.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/kedodudegezolomanexon.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/jojoxameketeludewimowemaf.pdfIn PDF document text
    • https://ismart99.net/upload/files/vegokexumabugezafogubigox.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/fuwiliv.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/37159435545.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/dokujajoximigopavixu.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/51718890993.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/foriserafi.pdfIn PDF document text
    • http://e-sportis.com/images/upload/93330076233.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/mugurefekenamab.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/68659244560.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/gomewibobimapox.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/xebilulapukuramazixiduduf.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/73196076753.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/nemiji.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f1e819ce---12445429362.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/tuwebemereb.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d21c920cfee167c64a9b2ae2df9455bf/97463489073.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/82694132760.pdfIn PDF document text
    • http://toonesk.com/upload/sugozumuxefarabuv.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/19863477183.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/xowuxugozowabavuzajo.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://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_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 11036 bytes
SHA-256: fa4c76eff2ab65993d7ff5d43653f676d6554cd3a32abf7e7002b07ae5da239a
font_01_sfnt_off00014ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16702 18456 bytes
SHA-256: a4682623212d040fb28dce20ebd5d8280f27ecfd35a999f8ac727e18212e37ee

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