Malicious PDF — malware analysis report

Static analysis result for SHA-256 d380d54c57e2c68d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 18:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a752c0d07aeec7cf5b6180f37d5042d7 SHA-1: b067198e5b517042466773f9f41b1ddf22cc567c SHA-256: d380d54c57e2c68d561aa3bba016031a038ab27cb3d2499c27499a6d1772ab83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, with numerous external URIs pointing to potentially malicious content. While no scripts were explicitly extracted, the nature of the PDF and the link farm heuristic suggest it is designed to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=clear+tablet+cache PDF link annotation
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1de9183d9---reruxavazunifaba.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/7837682095.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/vusaremulevizugaro.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/kevumunaregugujaximidod.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/43763902666.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/11/jonitanesiruxorugiwin.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/junidik.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/59124151834.pdfIn PDF document text
    • https://mollis.rs/files/79552147441.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/10330300636.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/29671242195.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/kuvijosaxaludexafiri.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/mizitedowafidu.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/49277790614.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/5750088623.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/luwuvegeronipudebaja.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/58723048296.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jakawakomomizakuboko.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/zuxikigamapelejed.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/99566621770.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/65669125188.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/tebopotesumonimizonuro.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/vebuza.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305ed80f2bf---niribuxukorexenobuxesi.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/82099540158.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/zoduravanadi.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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 18916 bytes
SHA-256: 67a5bb3a2ed02b96e05bce344d47a7a7bc25a585c0ca25d6a28cf03a542b9cc5
font_01_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 10012 bytes
SHA-256: c3f8a738248f3538fa9013995341155215e4774307ca510bbc98c21588b004fd
font_02_sfnt_off00012600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1