Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cedee0f33880e52…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 03:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86e5ae73f5777ce501745b761a441a55 SHA-1: 83687f1d60dcf446131d11938b704ce2c5867922 SHA-256: 3cedee0f33880e5217a2919543eb45a9232180e0e0087af02f11d7450920dcd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple external URIs suggests an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=basic+android+development+pdf PDF link annotation
    • http://snsi.jp/image/news_file/fuzumurejodixuja.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/52134046072.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/55113716148.pdfIn PDF document text
    • http://atomleasing.ru/media/File/18033639804.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/19678858678.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/98693750410.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/77017602072.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18566f5dd---43370239070.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/dofijakevazuxar.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/92214105092.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1632459722433086139.pdfIn PDF document text
    • https://andana.us/files/files/23151384236.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/40617940961.pdfIn PDF document text
    • http://alvitraders.com/files/76958392752.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/33350471917.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/395b253a1d989b8d256310e77a983dd4/lefenavajopi.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/1263015829.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/tomipemuluvejemozomu.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/45778971139.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/4320666773.pdfIn PDF document text
    • https://limsurdua.com/contents/files/62001044611.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/66214907614.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_off0000ade5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE5 10900 bytes
SHA-256: 0c8fb849e8786bb92cbe30c96fa80bd7742b8701cbde18513fa93406b59d0b9d
font_01_sfnt_off0000c729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 16724 bytes
SHA-256: 9b9455cf6fd044a06b2ee62214b828d850d076c64bf5f01d77b3be406e056914

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