Malicious PDF — malware analysis report

Static analysis result for SHA-256 b163f0d15d4e1bc5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 15:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: deff619eb774c9f8699d4ba50558ef1a SHA-1: 49ceeb3b0d8b272a8c05ca29edf0c12f2e90b457 SHA-256: b163f0d15d4e1bc56428007a421b7461ff793f9a3018b6a4c132e65cd8d1e60f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded JavaScript points to an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://alrabbanoilandgas.com/file/files/61707894069.pdf In PDF document text
    • http://kco.su/userfiles/file/73041974967.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1bde0c0026bcf5587a110ada6e516245/kikedebowikelop.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/99f12bbe01d787c76d6676cc9519ce25/xojalefujetamurejevafipup.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/81892835585.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/pusofojowuvazelaf.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/3323645325.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210906114957103252b4msdkr8f1pr.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/49513247888.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/45591420789.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/22180862700.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/mazemiluwalamaj.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/fowupozinukotatosinos.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/fifijufolawikiti.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/tavuvunujuxejima.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/golemexadojejilek.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/loradamobenovemano.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/wikavedenivilen.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/82404022974.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/lutaliwafemuxixedelaru.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/gerafijodakekav.pdfIn PDF document text
    • https://bawauang.com/contents/files/21832021990.pdfIn PDF document text
    • http://midospa.com/upload/files/79695394107.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/rilenini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=2d+shape+properties+worksheet+year+5PDF 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_off0000c49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49A 17356 bytes
SHA-256: 76b90e063abb75622afa276f3b5b1dea191754813c8a0829305e932f19ca5cff
font_01_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 10788 bytes
SHA-256: 9acfb42e9325f886ed920c36b48af9884b6d4eccd81913bf7b8c58c2d97b67f4