Malicious PDF — malware analysis report

Static analysis result for SHA-256 6357e63941ca3f63…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 17:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0abaaefc10fdb2fbc8bed70bcc898c80 SHA-1: c57c45780bd0e270db1c813475749a520204eb17 SHA-256: 6357e63941ca3f6338f824f7d6518b61a09341fb3f7738ff68baa2a309b2cf7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=infinity+blade+iii+android+apk PDF link annotation
    • https://tempegaring.com/contents/files/42335084314.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/lekekufekolu.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/62666337683.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/puguvowafitanabo.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/19708899376.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/56759236677.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/49933501858.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210916225749.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0586a75c1---86317080177.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/xojitisitorirexubufog.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/xajunuvidekebepuweda.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/masikipasozagekoma.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/94748085803.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/68416377772.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436eaaa8cd0---67370501110.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/puxaxumetil.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/57858652491.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/68702664954.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/8095118350.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/58648956851.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/75659720000.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/sogevewipedo.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/povup.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/ruwavexelekivupiwukol.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/37370874040.pdfIn PDF document text
    • http://355353.ru/userfiles/file/xurumadupodananuxuzero.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_off0000b55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55E 10620 bytes
SHA-256: 497554e8d4beb2935dc6606298eb84971d7e9f38781321e5ed44d7ef9a964b66
font_01_sfnt_off0000cd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7D 14840 bytes
SHA-256: 5e61f504005e11b8ce37b05b098c03a85b30d8d16190a41d6eedbb01c179ad62
font_02_sfnt_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1