Malicious PDF — malware analysis report

Static analysis result for SHA-256 5763240af98483ee…

MALICIOUS

PDF

73.5 KB Created: 2021-09-09 05:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d308dcda8fa3ac6734fe0277e980a16d SHA-1: 0df836b29fd16b691b9fca146e649461a47a5d37 SHA-256: 5763240af98483eefffd2d1a1c3fa4dbc289c9d1382e4da4c670043b283858fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or redirection scheme. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://accapierre.it/userfiles/files/sujorivizojekuwa.pdf In PDF document text
    • http://zjhywt.com/images/upload/File/53364394427.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/91177209578.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/zenosejezepikolujanir.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/jiwogereruxukiwuxesigaxu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133b3fc1e03b---19299388281.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/48246487207.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/soximom.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/rewupogepo.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/44676203549.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/73022319461.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/vobinoderadoguxubavesapoz.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/wegupoboribunemurame.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/loworakofupazekuzotape.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210908060816.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0a343733---jezazelawunoxixajitas.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/5780879132.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/55083808796.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/32746685293.pdfIn PDF document text
    • http://zamgph.com/uploads/file/071835106462.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/79846651885.pdfIn PDF document text
    • http://retrofotr.cz/files/file/gewuruwuxujegozivorude.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/60470729620.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/nineju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=123movies+after+2019PDF 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_off0000b80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80E 18184 bytes
SHA-256: ce5a87c62e441e9f49e3cf6a5fa1d488465dc9c1d5df7656ff16011fb9810818
font_01_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 10828 bytes
SHA-256: 841cb7916fa580719c2d58169f9c1bb1256d1d5757a31091d5b11ad17b35edd0
font_02_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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