Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb47b1d1b3265f8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 11:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fff1c60ae1610a8d955d54a1be058f34 SHA-1: 3274b2c850a356454f63873eeef84bc664de3305 SHA-256: 1bb47b1d1b3265f83453b6f8d53ceb93d67a3209dde755ae375f67f6b23376c0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting a phishing or redirection scheme. The PDF structure and embedded links point towards a spearphishing attachment attack vector, aiming to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=www+androidcentral+com+root PDF link annotation
    • http://www.alex-vasilkov.ru/images/wisdom/file/wefurilekexerigu.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/12345113020.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/10803334175.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/surolizetexajenapax.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/towuvisamew.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/nafovatipibixunab.pdfIn PDF document text
    • http://melvin.cz/data/25804133376.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/ruxibikijepot.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/19471281566.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/jeneruzijosum.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/buxunoputazano.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/70735560636.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/73306840547.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/napodotujodikin.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/28358888276.pdfIn PDF document text
    • https://heureka-cz.eu/files/22188188677.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/27855750156.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/muzeri.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/saxosejirupoxaxinopokame.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/27849645155.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/89065261406.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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 10440 bytes
SHA-256: ea9e6ace1c0cebf3e05f845aefb89c45a2b9ab409f471bddc1ee265f9bb1bfa1
font_02_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 18668 bytes
SHA-256: 689aa8a2746c2a80250a5924433c36f0719ae2b2186bf844fd4dcbc7b1674e18

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