Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f680703dfc5135…

MALICIOUS

PDF

76.7 KB Created: 2021-09-23 02:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4390df2e0840d9a89d8ff6b559db0c1 SHA-1: 5942d9cfa00f9ffae2c4733abdca24e461cd3265 SHA-256: b8f680703dfc5135c069cf59da09e9bb6e17be744418d2e3462fb75c1e935bd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a likely attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malicious redirection attempt.

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://irastuff.com/admin/ckfinder/uploads/files/61343094864.pdf In PDF document text
    • https://jagamimpi.org/contents/files/89464165481.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/7023022786.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/65589840095.pdfIn PDF document text
    • http://freetds.net/userfiles/file/varovi.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/taxom.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/76429246598.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/56142421695.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokazoxabikulidiwepu.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/tanedit.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/fipuv.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/bomimiwiwurepadepadiduwek.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109120947443258.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/6780703508.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b892b424b---44500905035.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/jewogadededetowabezibujoj.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/99214540227.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/tetewedolipunopiribimikij.pdfIn PDF document text
    • http://goref.ru/files/file/bugumefosavenexejumoxa.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/27199583652.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/faxotijutalunofozuvaruban.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/88903471083.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/funujakipitutixepenik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+jet+fighter+games+for+androidPDF 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_off0000c7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 17184 bytes
SHA-256: bc51d92af72b53715a00c6f7d5425174ef184c679fb2daac88ad30b0c11934e1
font_02_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 10936 bytes
SHA-256: 5a29c60164460be1e226f3553f628c1f9d95db305c207447f38160f9371ba968

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