Malicious PDF — malware analysis report

Static analysis result for SHA-256 8369e2691dc5d75a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-20 19:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eefb9ac9f69e82ce010f61c0286e86b1 SHA-1: 6095ef704a8230a1a0670141fc5751184f295647 SHA-256: 8369e2691dc5d75acfad3b24bb695236c8c7b8fbac3f90ebfa55dcc0e63601a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, particularly the one hosted on 'pretty-match.com', suggest a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ageddfjtjgrade.pretty-match.com/upload/files/44235179520.pdf In PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/sarimajojakiliv.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/matawogedozefixoguwo.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/20297641819.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/difiwipawozida.pdfIn PDF document text
    • http://elma1.ru/!upload/files/lafazigudil.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/90729749804.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cf5104683---nipikili.pdfIn PDF document text
    • http://grandfiltr.com/files/file/83504755627.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/lozonefitepuzinunidijat.pdfIn PDF document text
    • http://bronia.org/userfiles/file/50134790085.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630768280.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/fugokitezipopa.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/zokewuxezepa.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/21248022503.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/radokopojoxekokemumebo.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/69505274863.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/6235887451.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/wisimiwotenupix.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/saruvonasavavikirudawules.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/rosixibesalosakuweves.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2gfk4749qdapk075u9hhheotl5/juwiruritekevamulono.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/67288344660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=video+recording+limit+on+androidPDF 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_off0000b3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 15904 bytes
SHA-256: 4b129d89d7688f34ecdb9119dcfcae49fc6d2270ce3e90cc4f2bb90c7a2b13b2
font_02_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 10512 bytes
SHA-256: 0fb0b136833901e0decd8fe01cdf350cad72619058a72fd30b254570b61a1376

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