Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb8fe4a73ca0c9e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 17:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 275728e733980801164098e09065aedc SHA-1: 72d36762dbb66956eacdd8d08b888dcc2d37e1b4 SHA-256: ffb8fe4a73ca0c9e46caa036002a8dd3bcaa8e130bcdbf222e75d8512c99a78d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm with many distinct hosts, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drinkpoint.com/uploads/files/feterixivukixegon.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a43f05cda---panowili.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632646531.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/xegelo.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/35411768948.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210909_005626_167.pdfIn PDF document text
    • http://geasit.it/userfiles/files/supovobisekutudijeno.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/14534733287.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/65446848308.pdfIn PDF document text
    • http://thegioioto.store/upload/files/jijolozitiwenekobaxewape.pdfIn PDF document text
    • http://air-ned.com/uploads/files/vusuvamezamemupi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e51d10a77---56850158325.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/ropovovenanol.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/50142272436.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/60783984461.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/gitemu.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/dubonib.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/33154125005.pdfIn PDF document text
    • http://master-vin.ru/files/file/66631866743.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/razebapipamijo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/talunamukidowosugojaw.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/laluzitovetamafoz.pdfIn PDF document text
    • http://dogable.de/userfiles/file/56891252674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mobile+app+emulator+onlinePDF 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_off0000b276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB276 10476 bytes
SHA-256: 3783280eadb185b5986731c9a67e080204cf4694cb96f61c9dee909af3b01b81
font_01_sfnt_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 17024 bytes
SHA-256: 9f38943e7ea8720e454d2142748b10d372c909216f49193c7a2e4661b578543a

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