Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbba7557e025fa6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 19:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3aefd20a7a52ec91a599d390c6d09ae8 SHA-1: df82ac5516695d6f9f5acf85464120b742c5b9d9 SHA-256: 1fbba7557e025fa636980a3b2ac4c8085fc276322cef9a282d536c936ce62ba9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to potentially disposable domains, suggests a phishing or malware distribution scheme. The document likely attempts to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kengosushionlineorder.com/uploads/files/70070530971.pdf In PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/43c7b78c3429f1680f63e987fbf1689d/65770879891.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/54871386648.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/29199600048.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/76901408019.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/12876750232.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/94758916188.pdfIn PDF document text
    • http://abc-tel.ru/data/File/junupejilej.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/79547080714.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/55381356734.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/84514797075.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3cd776b04---20895312411.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/87723798779.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/413298455.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/puvazi.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/nowolix.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/rugekubemekoroguzizefi.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/maworidinof.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/77547145391.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/29480891515.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/ravekulejuzoguniguzerajir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=modern+physics+and+quantum+mechanics+anderson+pdfPDF 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_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 11192 bytes
SHA-256: 23f311ee02ab690e9c17da7398c0b6b0ca65915a0d0d200db9a04ae75c04a09a
font_02_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 18028 bytes
SHA-256: 8ba6040d30572966cdfeaa82d328f8a317d4c2112b0178f2bf125ce95eebca27

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