Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb5841858b6145c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 20:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20d56464acbfa6225bbe901fa9f35d8f SHA-1: 2f382e454d90475b5638ddb272e73e3b5feebdcc SHA-256: deb5841858b6145cc9c0280e879053a923a18f3843b0f90a02f2e4085ff947e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host numerous links on disposable domains, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=alice+in+wonderland+book+pdf+download PDF link annotation
    • http://turskazka.ru/ckfinder/userfiles/files/93436320965.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/7259571274.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/68653247137.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/volosadajixufolafofufug.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/5081307321.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/9921974973.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/36282744050.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/15561781309.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/92723569711.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/90403715450.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/15314314511.pdfIn PDF document text
    • http://sin-hua.org/userfiles/41331208696.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fhknrbq6recst5ufvau7vubp3k/22427060202.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/rupaposeniv.pdfIn PDF document text
    • http://goldmustang.ru/files/files/73498722687.pdfIn PDF document text
    • http://chinahongji.com/d/files/sapun.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/83402553199.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/33210542866.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/34149856690.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/mamisopetewubopaxibiwa.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/78469714023.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/74211796981.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/77657771053.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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 18184 bytes
SHA-256: 72d23ef3d7366dc92d19ed24d8acb701aeb30bd631cec1cdcd94df3f58cc051d
font_01_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 10644 bytes
SHA-256: 8ddaa135b5c605e72693b44daaeac85e5ffa5d7606eb7823be26ad72de9bbdb6

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