Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16988b0ac14a99f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 06:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b048023b2979118cf1363b0bff5c6c68 SHA-1: a3c96d409380565d2d40d7a21c3ef81ea29f28f2 SHA-256: e16988b0ac14a99f80c569a3e2691f6f65895cb29ac2006c9d88d68002f593c2
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier strongly indicates maliciousness, suggesting the JavaScript is likely used to redirect users to malicious sites or download further payloads. The presence of numerous links and the PDF structure point towards an attempt to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 5

  • 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 https://doctmcooper.com/userfiles/files/rodawupofizadugovozake.pdf In PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/64757102320.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/bogodomujizibenaf.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/jojamowamosujaf.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/dapejizugoxivetepizenibob.pdfIn PDF document text
    • https://tavio.ru/files/file/jejurutinazofiduxixopazuj.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/liluw.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a079e67eda---pezekofetudagasu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/73124154301.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/57163549309.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/55319613702.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/gurodi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0fc0c48e2---rovidowolitedowe.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109061857095060.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/90313454290.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/miwevilidipikakobax.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/kimanuwufav.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/53225068801.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/zokowiduxeleku.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/nupumuzobizogijife.pdfIn PDF document text
    • http://fluorescent-training.com/file/10197798979.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/ranuwopetemobotu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/tovufududajoxumozofufola.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/pevufetusad.pdfIn PDF document text
    • https://tch.lu/files/files/vuwusixerizurirowibad.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/paxanitozunoxep.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/kemenuxafilenikadomawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rom+pixel+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_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 16668 bytes
SHA-256: 3542bd79a545157caecf84f7cc4f9710480db92c54380f294d47b8f80f272652
font_02_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 10060 bytes
SHA-256: 010d50d2f8bd7018c6915f08cebf260c797bf858f648f2246f916badefa1abb8