Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1e31d1968a5483…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 02:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0929f6eb83f0dac30a6d305da11ca391 SHA-1: 27d88052705859c6385734a59b7628e7c321671b SHA-256: de1e31d1968a5483c59c0b1c454664fdd733d165347c78f1790f9ec12a900a6c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. Heuristics identify it as a potential phishing or malware distribution vector. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=biggest+country+in+the+world+2020 PDF link annotation
    • http://heryeryesil.com/resimlerfiles/63453329980.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/fukewezave.pdfIn PDF document text
    • http://effektfilm.de/files/file/92178390762.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/75795137550.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/30380422584.pdfIn PDF document text
    • http://annabarons.com/files/files/zizitesejefijixogan.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/36526510839.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/zixejogadajareripipakuw.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/13923556625.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/25961442562.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/49377809628.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137761f50ef9---15645074786.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/jagezafeselewatife.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/95652902064.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/xagixinorur.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/wozijimega.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/89288704141.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/devabikekowafivodejova.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/59633235922.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/49075548822.pdfIn PDF document text
    • http://xn--z4qq44i.xn--kpry57d/upload/actfiles/divupezajulerazeted.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/mabegotevixezore.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/11174698741.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/99239951031.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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 11084 bytes
SHA-256: f51322254279a1ed850f0a1cb8458c795198c3f00530e4c693ddecd33e55091c
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 17344 bytes
SHA-256: 6e7e4727ce77524cc3a40ae983a4772e194efbaf2faba595b26c01d7ed7a2895

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