Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dfaaad4206ca52…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 17:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad6158f5cc8e7f2354cddce843a23fcb SHA-1: 331c92aefa802dca251eb1e45252d95d5712d8bc SHA-256: 84dfaaad4206ca529f4e9dea6aae66003f846df93caba407200993ad5a83519a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or spam campaign. The PDF structure itself appears to be a link farm, directing users to various external PDF files, likely to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=new+features+on+android+10 PDF link annotation
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/namowoxuferid.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/bafusasowil.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/zuwanejemejogewosegos.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/vefumibe.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/60051401757.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614c09808d473---sorakeniworatesesadijiwum.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/21649708828.pdfIn PDF document text
    • https://designclarf.it/file/82184316676.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/nugabekixojadalivugobawu.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/40665227894.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/27661111094.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/78377804850.pdfIn PDF document text
    • https://baglab.pl/galeria/file/kipozofenot.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/tufupobuzebadaxe.pdfIn PDF document text
    • https://kokomanis.com/contents/files/66283411075.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/rusonesetagedogovupi.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210904230524.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/tenovaxadimib.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/tatixatofibojeluzif.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/91523811412.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/92191280713.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/36362354924.pdfIn PDF document text
    • https://dalba.net/other_files/File/juteme.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/47250655759.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_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 16708 bytes
SHA-256: a6072e010a3d24831beecd15f0764de1eeb51ee941d43d2822bb4838cda0a6cb
font_01_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 10636 bytes
SHA-256: 3afc79f494ba3d16a581c02b158afed6ad9ba4be10149bae978297bdf97c25ed
font_02_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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