Malicious PDF — malware analysis report

Static analysis result for SHA-256 c349fc93657639be…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 02:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0415381317050da8a12f2c5f8ceedfa9 SHA-1: fa17ea452f9cfb29f915661bb475b721e3a5eb11 SHA-256: c349fc93657639be2accb23bd96d048ad11c3067f837f21b2c06730cbb071cf6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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 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 http://pk.mo/userfiles/file/sefove.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e94a93f9502280b8c21f42c57dc03f6a/7778538265.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/moxewunozanera.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/62876680585.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/58524377866.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/58809583623.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/70141771567.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/13608933554.pdfIn PDF document text
    • http://chamdure.com/DATA/files/92610656489.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/tamere.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/wamanajeguk.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/94472576768.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/wafozodowuxe.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/wamamekem.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/34472170174.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/60369338518.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210901001944.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-21/images/files/47213526157.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902122635.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359cb3987db---jukaboguxoga.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/62317883746.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/20070665666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=20+50+house+plan+with+car+parking+3d+elevationPDF link annotation
    • http://forum-auto.ru/data/files/61422675186.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_off0000aefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFA 11588 bytes
SHA-256: 67a4856212ea9c55793e9f9fb4b79029125459924eef0e08bcb9c7411cf764e3
font_01_sfnt_off0000ca61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 17364 bytes
SHA-256: e1843908be3f42413b4aef3bf76d56760a8d1b55d627abd2bfa8e66c06b5ef06
font_02_sfnt_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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