Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f61bf5afb82b383…

MALICIOUS

PDF

75.6 KB Created: 2021-09-27 00:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b03c228c180482ed697d39714802e3a7 SHA-1: b768cf987bdfa735c1ae7bb27f8ff07e28431b3f SHA-256: 8f61bf5afb82b383f9e49ecbab8eab704fd16b19cdac3fa0c5cbc6d81d560dbf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution campaign. No scripts were extracted, but the document's structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=sound+widget+android PDF link annotation
    • http://makesomenoise.hu/upload/file/25590818941.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/tumusosorumurigimimewev.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/93514789356.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161498813c8e63---zitomu.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/28394111412.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/ludenudobepa.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/86422671292.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/vafigevago.pdfIn PDF document text
    • http://www.bandungmesin.com/file/dikiz.pdfIn PDF document text
    • https://aayams.com/userfiles/file/88671232598.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/63169680750.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/39312399783.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/75926139883.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302da4401c6---32733154953.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/zarurunatobukawav.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/vasuniwokawepulo.pdfIn PDF document text
    • http://holzweiss.at/12123297212.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/xofewopom.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/52467332617.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/dolaxobawolusumefafazo.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/zusofemelonetem.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/kapoxawoxu.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_off0000bd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0C 10472 bytes
SHA-256: 45b9dc2354ac6fbdebe71bd7c91d0ad11fc426386e4a6131fbd73966db3169a7
font_01_sfnt_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 19988 bytes
SHA-256: a88b03edcf39bf8c0c8568b4ea7582f66d2b83199652a84019a5583a7b37ade1
font_02_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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