Malicious PDF — malware analysis report

Static analysis result for SHA-256 d540cb29dddc02b2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 22:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 853759fbc6fa118952b7bdba26e2ef6a SHA-1: 271e326b0e2209ba7f3a6010c4e2030cb7aa8dbe SHA-256: d540cb29dddc02b21b70a1e33c67628c5540730e4b9aeccd757190795ddda793
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and that the PDF acts as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://allytemp.ru/uplcv?utm_term=best+space+wallpapers+for+android PDF link annotation
    • http://sladkiy-ostrov.ru/userfiles/files/xasikekajijojevumo.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/sofezupelolizo.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/87966574356.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g4jclgr8nnb0bam1dlsatmk6i6/31757732898.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/jigurezejegazukaronile.pdfIn PDF document text
    • https://arerp.kr/data/file///fobanenivor.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/14704339601.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/milesarimarigokixafeb.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/lomunumofuweter.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/41033658699.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/tulideret.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/8943273802.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/manitudonigum.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/64560438681.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/78938548794.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/tejaxan.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210902224625.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/kupukaluzumatox.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb0c04a92---mukamibomisisutoxut.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/mamugetotalimemaxujabop.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a665e8cd---33822846978.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/kolasosukuzugub.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_off0000cf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 10752 bytes
SHA-256: 89169d557f19ffca5071f098e82c089193994036989aca2a08ad349bfb64e0dc
font_02_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 17772 bytes
SHA-256: 2fb08aebc7dde4daf0ae5625da12042dd89e027d74687f6945c8faf6bd52a60f

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