Malicious PDF — malware analysis report

Static analysis result for SHA-256 943fb8ec198edfc5…

MALICIOUS

PDF

73.1 KB Created: 2021-10-02 21:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3ecc5f2750a83fcc077fa08571cde4c SHA-1: 43bcb183d780cc7c9c4a38a5490b5841c5a0a196 SHA-256: 943fb8ec198edfc5e579602eae43818bb1e2aff0c0bda68eaccfa0435a56893f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://trieurodata.ro/images/file/19878889481.pdf In PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/nosidatepabup.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/vawodusozugalikexeliwux.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/tuzibomaxugenokovu.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/naneboxuwazelukimaginus.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/konadutiwokinufu.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/zapifexowed.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/51794075025.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/46391195841.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/fusirevesoxotaxoromew.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/2389725386.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/banolopabulik.pdfIn PDF document text
    • https://medtek.vn/storage/file/71836840630.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/zikuduwejenuxeru.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091118075611.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/42147378484.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/41773124014.pdfIn PDF document text
    • http://matras-devison.com/upload/file/wikenolinopinuxido.pdfIn PDF document text
    • https://podimercrm.com/img/files/wezotafirefit.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/67291917648.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/joretidun.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16144f84793499---80164747348.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210912052136_422412656.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ceba26e48---8267278543.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/gexeduvojizuviji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=frozen+2+full+movie+download+englishPDF link annotation
    • 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_off0000b6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E1 17944 bytes
SHA-256: ab875d13cbed4440fa9463ecf36685f56aa316a7b391391b09b9cd4d4b917c81
font_01_sfnt_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 11112 bytes
SHA-256: 05548a5b7c9ed2fbb0a7e9618bfaba142761a9282b9601df3db38ebaee8cc83b
font_02_sfnt_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1