Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6486f2654cd02b…

MALICIOUS

PDF

95.2 KB Created: 2021-02-27 06:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0d554c9a62c6d95c2b67b9ca6686ea14 SHA-1: d27fa0f35a8bf0d3332f47b2985bba3a2904cb5b SHA-256: 9d6486f2654cd02b8e800756b3571303110ca89d5e9a2071b028a7e104d2fe37
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness, with the latter identifying it as a phishing trojan. While no scripts were directly extracted, the nature of the link farm and the PDF format itself often leverage JavaScript for redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/123?utm_term=what+is+memento+mori+youtube+channel PDF link annotation
    • http://eurozone.pro/valkyrie_crusade_reroll_guidesj2ch.pdfIn PDF document text
    • http://copyright-notice-ig.com/508021107062mee7.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/8969559.pdfIn PDF document text
    • http://cancandance.org/what_management_skillsoxopc.pdfIn PDF document text
    • http://vrestoran.info/carelink_professional_softwarej3sja.pdfIn PDF document text
    • http://uablog.website/word_chef_answersbix94.pdfIn PDF document text
    • https://vipozuguru.weebly.com/uploads/1/3/1/4/131483083/524520ab8588c.pdfIn PDF document text
    • http://motivawka.online/florida_economic_loss_rule8h9he.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/79426300885m1x0m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wemupajese/87083103481.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/15050331028.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/lulu_guide_season_8.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/pazogapefemopasenigivuki.pdfIn PDF document text
    • http://jupejorix.epizy.com/gudawikidadufavux.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 6740 bytes
SHA-256: 68032a420e4a13d6e11cb9af8c4326406a16df729921b020c63c9bf8f5102b75
font_01_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 5292 bytes
SHA-256: 91564e5e1d0fd43eb4c50eab17328712189c42eda97cb99faec0e5c94804b230
font_02_sfnt_off0001300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 12584 bytes
SHA-256: 793ee6c79778524261736a4ea36259247307cb2ebbc345a03e0851764df9ffeb
font_03_sfnt_off00015a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A54 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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