Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b49cb58278e3fc7…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 02:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c65b983012933fac51b27e64bb1a7eec SHA-1: 8bfca2808b276c2da08c8dfa9bf27ff1a5c476e6 SHA-256: 2b49cb58278e3fc7d266eb86a38b5678fcb38ef133ed67f8ccda339508b7638e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are structured to appear as document downloads but likely serve as redirects to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for malicious purposes, possibly phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://cructi.ru/uplcv?utm_term=utopia+book+pdf PDF link annotation
    • http://nt-module.ru/ckfinder/userfiles/files/kagigarajozusu.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/pumosowowe.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/64150732525.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/zidigofikaxinadov.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/94090689339.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/25446134640.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/31054428554.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/29381442866.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/bugewizelisi.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/xafatubowowenututesizuva.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/96164632518.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/tobopepinivoled.pdfIn PDF document text
    • http://only-svet.ru/upload/files/ropute.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/mesakuraxerusetiluzojan.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/81114381110.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/fulamipuponuvurusa.pdfIn PDF document text
    • https://steammining.com/userfiles/file/wuturukukijapanitelujox.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139f797cc22e---tujotevezek.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/41823725451.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630663519.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d26ab084c4---56740586071.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/84123741005.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/napalijijamone.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/nikajuz.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/42708870647.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/90742451317.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_off0000c8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C5 19376 bytes
SHA-256: c117a543b21f51f91e1003e3dd30cf920c6933495be1c0d3552e90c4c819ddc7
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 10180 bytes
SHA-256: 243d253a4de0e6d045379497c97719720c1f25752afbeb5e8be1d9b219ff4cbf
font_02_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1