Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b8243e628d4ae9…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 13:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c46556951da84eec5b27e4d5ea39cc72 SHA-1: 38fea14273dccca7c6446964fd847b5e3805f5c2 SHA-256: 32b8243e628d4ae903db5d763e7a54fbb8b67d33aa5aab8c43f84394eb79bebf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to one of the numerous external URLs found, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cructi.ru/uplcv?utm_term=route+tracking+app+android PDF link annotation
    • https://pfhotel.gr/ckfinder/userfiles/files/datamagudewawuzaz.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132416802a2b---79256845004.pdfIn PDF document text
    • http://juentai.com/userfiles/files/78518730958.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/buwijafaramukuto.pdfIn PDF document text
    • http://petrduchek.com/files/10775689083.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/tozaz.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/76445826853.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/83031019757.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/dujikoreda.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/binoxiga.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/64102684215.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/16080315246.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///noromilinu.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/86937212757.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/zoxizipijamuwofarumekagod.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/fanur.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/81631218446.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/zotufitugofug.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sivibudetuzajufubod.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/mikuziwitadetug.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7ac6oiukk9vrj5ubci03oikfg9/wobano.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/27226665850.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/62321951794.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/61666112802.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/beguvogevelewev.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_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 17348 bytes
SHA-256: f09af7e69903f9d0d1d5bc53035cc770e7cc6cec9b888eca9fd14803d6504ac6
font_02_sfnt_off00013a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A16 10712 bytes
SHA-256: 2ca2285dc2f7d19fbf416e1ef5c4e52d8c59efa217c90a2c040c2026e2f8cca5