Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbc840851ed3b39…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 22:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21a5ed8c36992847985f1b9b1fd6ff12 SHA-1: bae4a7dee7694d97273ec729d0abaacb26e2a024 SHA-256: 9dbc840851ed3b39ce798dc9257208e36661fe9b138f2d527c8a8ff18268f1eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or scam lure. The presence of external URIs and the overall detection pattern point towards a phishing attack delivered as a document attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/nidijawonuzemum.pdf In PDF document text
    • http://www.larucheapain.fr/ljk/file/gezevalisebu.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/bipazafu.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/40545848647.pdfIn PDF document text
    • http://habibitours.com/ckfinder/userfiles/files/xamas.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161489ad686237---kojetusikafuxezasilexojaj.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf13b0a26---luzawajananewe.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/wobivawogexuzix.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/87503513832.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/vokiwaxoj.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/12853742797.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/26713348381.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/44602419493.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/86825898752.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/nivipujuse.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/55244833101.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/pojunar.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/xixutijasitojeko.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109120227502744.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/33895142698.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/foxuxoligorebubudalugem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=play+store+app+mobilePDF 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_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 17956 bytes
SHA-256: 8025f16aa2b8532927f2805e8d4c340255f163f154d3050b5a4c12fc893bde71
font_02_sfnt_off000128db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DB 10564 bytes
SHA-256: dd7813d99a545966391704280c84f476a5f6d5d837f2225cb7649b976838dbc0

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