Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd933abfa8cba56…

MALICIOUS

PDF

87.2 KB Created: 2021-09-19 04:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c9b7ad7dfd6bbc9ff7f09270fdc329c SHA-1: 0c6d1b55650fecc2b89a5ae35fcc738033764a91 SHA-256: ccd933abfa8cba56ab25ece3ec072143eb77c6a4a2791ca988914a3ae6a45f4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=stock+rom+samsung+galaxy+s2+gt+i9100 PDF link annotation
    • http://xmzhj.com/UserFiles/file/zisilunixaxazotudo.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/58813091837.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/zumazizolozi.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/73014779078.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/pufusotukikukunag.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/gixavigitadovojeziberiwas.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/dokuxaledibusokezox.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/21151034496.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/pezowatudileluk.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/46249100813.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/22737261256.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/81107126853.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/luzuwafawusopibegexuf.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/44108971688.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/97086889205.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/24294734123.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/48212575206.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/70719428051.pdfIn PDF document text
    • http://hflchw.com/upload/file/41071990593.pdfIn PDF document text
    • https://ptogel2.com/contents/files/rafakokejas.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210903_023422.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434817629f1---54251201921.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161392d4a211f1---wafibugazetofawufep.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_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 11388 bytes
SHA-256: 12fcd53c3525d2c0e0479edc37a71d410d28ef3516fdd999421f25d499e23542
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 17872 bytes
SHA-256: b398c40fce593f177531ff267256c66f81b7428c3fb924c6c397d2242ee1d3a0
font_02_sfnt_off000136c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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