Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f775f72aed45e4…

MALICIOUS

PDF

94.9 KB Created: 2021-02-14 21:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3cc322f5be0bb2040aaced598a7f02e4 SHA-1: 02e7db13ae71353ec3a6df96be193cfb51c28c05 SHA-256: 43f775f72aed45e43fbecb8829c4da3e074a30e10892f132fb10c670ba67be18
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing a link farm, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=iron+%2528ii%2529+oxide PDF link annotation
    • http://ig-copyrightviolation.com/changes_black_sabbath_sheet_musick6wmn.pdfIn PDF document text
    • https://dinabowufijub.weebly.com/uploads/1/3/4/7/134751612/petejozi.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/vomud_zeluxa.pdfIn PDF document text
    • http://lisifakus.66ghz.com/empire_building_games_offline_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5feb2df635d8f.pdfIn PDF document text
    • http://mon-compte-cmb.best/guitar_strumming_patterns_bookug4em.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466662/normal_5ff712e9c6012.pdfIn PDF document text
    • http://reduslim-shopofficial.site/6628867626n4jjb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366344/normal_5fe4ac3ec083b.pdfIn PDF document text
    • http://hytri.com/rakegiwobofotowiguxkub3u.pdfIn PDF document text
    • https://nefupoxuwuridek.weebly.com/uploads/1/3/4/7/134747690/9561535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_6027c7daa1598.pdfIn PDF document text
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/8691186.pdfIn PDF document text
    • https://lularufopit.weebly.com/uploads/1/3/5/3/135326527/wexez-vonipapememot-bukisoxemet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_5fdb6bb55f70f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_601a22d6a4dea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gudanomakorake.epizy.com/calisthenics_training_guide.pdfIn PDF document text
    • http://divojeniro.epizy.com/change_management_process_flow_guide.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://scripts.sil.org/OFLIn 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://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_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 4556 bytes
SHA-256: 0ce01edab9632bcdbce0c9825c809074c61a7bb852e5724cfbd30966319bea98
font_01_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 6300 bytes
SHA-256: 33e079d314e8ac6127b1e3ef6c589fac86ee1747e1198796ea12012fa2a002c7
font_02_sfnt_off00012e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 12628 bytes
SHA-256: 86238281902c7da8cab5d926de023179976828a3f946951b84c52bdfe46c28b6
font_03_sfnt_off000158aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AA 16208 bytes
SHA-256: e7e5b6b343a752ab0f7359bfb84f81d8bd846b9ae37ac80eb3a71f9cba6f929e

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