Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8efc08cabe82ecb…

MALICIOUS

PDF

75.5 KB Created: 2021-10-10 13:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d77c9ffdffe586200fca4d9a17e55a27 SHA-1: 2f30985447f5795cc4964f9c7f34c1c60af13270 SHA-256: d8efc08cabe82ecbdce460df6eb25f8122216a64da29847c66437dbc4a17f0b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is used as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://volkshilfe-vlbg.at/images/content/files/44858174855.pdf In PDF document text
    • https://elnativocoffee.com/silver/upload/files/8883692578.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/76607813858.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/sukatawuwutadomadawumuzaj.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/77865157823.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/73855581988.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161e7a80f9be---fivedewumiwox.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/bifutojebimom.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/gagox.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/68277315072.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/duluk.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/jejotivalotenogimugesaxi.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/zodonejivad.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614b66e6555c1---pateleromogufato.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kugokokejazutexafukatubu.pdfIn PDF document text
    • https://profm.hu/files/file/54241315173.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/lejijenusoxogowegoxito.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/50541110870.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210926183037.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/juparaxuluvunap.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/vomawuwijofusexokatanulub.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/90153216983.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/votegizabapipoxubaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=organ+preludes+for+church+services+pdfPDF 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_off0000c458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 16620 bytes
SHA-256: 96aadf755201dcc73bb66db380a5390402a7fc3920049be5cffb0188b4aa7d85
font_02_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 10992 bytes
SHA-256: e01363a4164291802839b9e349a90cc733ae5391a96d35f95c33934d89bbde5d