Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ee9e0521cbb980…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 23:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f7aef81c86e1274df4714fddb21b7d0 SHA-1: 1272202da443bb3360280994070a49e5df42b42f SHA-256: f1ee9e0521cbb9804e7a32506246841c779044c2d558891dd51ce546675ce38a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The primary purpose appears to be directing users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://agedwedfjtj.pretty-match.com/upload/files/20059680114.pdf In PDF document text
    • https://himalayanthailand.com/image/upload/File/90064425224.pdfIn PDF document text
    • http://teifsepahan.com/files/file/44491176694.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eedcd00f8a---16856356415.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/99666287209.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/rujovivikig.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/17823630585.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/fovirinawa.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/74999641016.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/25617130630.pdfIn PDF document text
    • https://oferta.lt/i/File/76861264484.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/83192739508.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/91440305545.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/laxelidatitowitojenekesas.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210902091102.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/zowujol.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/21214909689.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/37819574273.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/35379795266.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/favosodemukubewowemes.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8tq36qd2m11fcc22e38gp70kfv/21002770905.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/galudipomalev.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/45327613425.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/situzupolifibamisaradapu.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/64146598536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=clap+phone+finder+apkPDF 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_off0000cd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4D 18216 bytes
SHA-256: f87b3e5956b2ba63b06511c21ea88c24748c82e76475089f5b4bfd70058b38b6
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 10452 bytes
SHA-256: 0f7dee43a04b0d16d64ccdbd880f5c3039f497ae46780e7d55219414d7dd2651
font_02_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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