Malicious PDF — malware analysis report

Static analysis result for SHA-256 628aab78eb5654f5…

MALICIOUS

PDF

75.3 KB Created: 2021-09-25 18:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d400841d7e88821c742a5fcdddb55d9c SHA-1: c5c97a9f67e445193570edc522c11626aec18ea4 SHA-256: 628aab78eb5654f5faf5d66942a596edea1e1f5735d1e616d3be7c6732da085d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

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 https://synerhu.ru/uplcv?utm_term=revelation+commentary+easy+english PDF link annotation
    • http://kientrucsangtrong.com/plus/files/zolezasukevobamifazome.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/jejagubavusaloju.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/16304035254.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/jijamojularexitafod.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc19647b6---11552560628.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/26373036165.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/52054718597.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/jedapavepejalafuboneku.pdfIn PDF document text
    • https://toocapen.com/files/56706628508.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/fapaxeminu.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/zuzemixinu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/60db3ce831714804af661194415309fc/91037124116.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/fobemurolin.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/3278391365.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/xowar.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/talelupixeni.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109240551096206.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/13073274333.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/zokabojuniranofiziwogukun.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/66881205941.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/60435619467.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/871a2ded2e77d0defcf9c1679513e49a/28071894953.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/tururugibenolebafamiri.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_off0000bebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBC 10904 bytes
SHA-256: 2bf07c2f61fea3b291615de3307305226d3c4df5ef4285f04d05301ee7785b3d
font_01_sfnt_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 18300 bytes
SHA-256: c14f9526d476f88959bbd1f40e7e994f2b429619dbbc2e23cd990b28fbe866ba