Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06f3b485a3a6183…

MALICIOUS

PDF

91.9 KB Created: 2021-03-31 01:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e689cdd861c44a96f22373f45b29ca77 SHA-1: b35ff2e0bbd8bff0a5d7be09f86e934dbc8a5146 SHA-256: c06f3b485a3a618381affac9c6c2869a6e101d7c522cbe921807cf1e21a3417e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://dugedepap.ru/strik?utm_term=what+happens+when+you+exercise+30+minutes+a+day PDF link annotation
    • http://fodosokidorakig.22web.org/laperozileres.pdfIn PDF document text
    • https://wiwazojuxosupud.weebly.com/uploads/1/3/1/3/131379189/dawugejop.pdfIn PDF document text
    • http://mosiruduv.22web.org/17456614184.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/87e0af1355.pdfIn PDF document text
    • https://cdn.sqhk.co/dovewobojeb/dK5jarU/dupewewemabudefuzejegaj.pdfIn PDF document text
    • https://cdn.sqhk.co/mimizajig/geifBjb/48597009193.pdfIn PDF document text
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/maxokajudunevoduju.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/kujim_xemavixalelad_zudofodusejo.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/godakigotubeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_7c0f12a74bf04b7eb8fc43401fff92a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/rose_gold_glitter_foam_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b51477-553c-4ec3-866d-569304294470/45310685114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21498d0d-0442-467c-9727-c2dae0e9f209/thirteen_reasons_why_season_3_episode_5_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/dallas_mavericks_rumors_bleacher_report.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_4c28b2ac5447458b9430090d119f5fbf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/skeptics_annotated_bible_online.pdfIn PDF document text
    • http://kizifisen.rf.gd/91464944139.pdfIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_e1cc497cddd44514b4eb2d6915144035.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 5860 bytes
SHA-256: d8a6beaaabfa04a1ed80df2526b342740c0c4c61cb0ae631bff8f87233aab303
font_01_sfnt_off00013e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E30 10752 bytes
SHA-256: b973e1e4e67af3975f82c9b27693b1c863670e55cb2a02a1253f8c10ab76d8af

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