Malicious PDF — malware analysis report

Static analysis result for SHA-256 1405e3b72284dcdd…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 02:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 039c15c6770182355caf9aaa8b1d0827 SHA-1: f20914724518e3b787e9e0ec4f107ed152cb4ca7 SHA-256: 1405e3b72284dcdda65cc35ff1b8cb968d461afc5ec11d44c31c997acf60a91a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, disguised as movie download links. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=the+brothers+grimsby+full+movie+online+free PDF link annotation
    • http://salonorganica.ru/upload/files/31830652161.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/nomujutumilivevasimatana.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/nirokewukimulina.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-16/20210916051938298819.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356f9792bb3---27617788054.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/lipurulazukej.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/68680264087.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/zirejozejutogisimofemax.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/67593030371.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xoxapodiku.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ffca0006440a583f53bddf2f5f23bd38/52989787828.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210912120743.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/14048633798.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/98823745401.pdfIn PDF document text
    • https://yasacompany.com/upload/files/28190131583.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/69753127960.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/30485409926.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jefixuratodomimunowerel.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/viwekodatorizepifil.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/lokumelanabebowakemo.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/siguguzinoguvorefijuxak.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/35170160058.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jemuwofesobipuri.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_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 10880 bytes
SHA-256: 3afe4a73d377a3feea61513a0efa01f28714d847095b4af9635a5ff3834d07eb
font_01_sfnt_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 18280 bytes
SHA-256: dad66a4a42b35adb9c4da6b20cffe00c84ef0169556f1a879edd127918817c51
font_02_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1