Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b304e4c5a2e8162…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 05:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4817331bc48da6531deb934b36d1d95d SHA-1: a8e6f43590f69ef885537329e25abb4d4c9d0a0a SHA-256: 4b304e4c5a2e81620ae63eefedd80ae63006d035391c936cd9216a14ae8b3c3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=how+to+fix+dark+front+camera+on+android PDF link annotation
    • https://terrebleue.org/userfiles/file/6900272837.pdfIn PDF document text
    • http://chpcentre.com/files/file/kesotatasalojusa.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/nibabuladarojafan.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/38654455285.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/dalobevopikalakuregofapi.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/45609428070.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/80949208959.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/36487294834.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/13741326038.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/dafuxogajav.pdfIn PDF document text
    • http://rooptex.com/uploads/xasomimaletepuk.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/62580639482.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///14078195276.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/50435813186.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361663ce978---jazajiwejobekazimepukuj.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/33c1cd5aa9ae4caec8f8a5e3f55a1b8d/susulasig.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/23493716453.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/nixemoduwerevajogafep.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/xujalowaxor.pdfIn PDF document text
    • http://elsped.hu/files/file/23297490909.pdfIn PDF document text
    • http://abpaluso.com/upload/file/79166302157.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/dagudozu.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/xutezum.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/bekoxukaposamewuw.pdfIn PDF document text
    • https://servicepapik.ro/files/75211724776.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/tugij.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_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 18848 bytes
SHA-256: 2d1fdd16d79fb8f3c65bf6808888735aad610be7cec960985e3dc01ac1e7ecce
font_01_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 10692 bytes
SHA-256: d00c9b98cd9d938fd827819c8a3dc6ea373f1b22f6c5d765a33802e08d8079e6