Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1460d94aa2df819…

MALICIOUS

PDF

80.5 KB Created: 2021-10-09 11:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 283abf5d820672e86067036b7ff14656 SHA-1: 421909ebcf6c867c1233642a3e0f9eebfc6dabec SHA-256: e1460d94aa2df819036023e9baa937ffd245fbfdc4db26caf16621a55cf029a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified multiple external URIs and a link farm on disposable hosting, suggesting the document's primary purpose is to redirect users to potentially harmful websites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=class+6+science+assignment+answer+5th+week PDF link annotation
    • http://radio-salsa.fr/php/rs/filesupload/file/fumifatedizijini.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/razifepu.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/bijikitobo.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/88071274358.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/zugazugibikinarusenokor.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gufiguxulumenuwekeziw.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/85071762204.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210912075730.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/25124945214.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/tikemidalabapavibenar.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/53820795679.pdfIn PDF document text
    • http://tdbm.vn/upload/files/23027747701.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/lm57qfggfjt28lkf6pvuq1vkv0/28736718293.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d6c822ad4ba52b491ddef7fb2cbb51bc/11442581548.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/nemamivonameritifo.pdfIn PDF document text
    • http://friulanapanini.com/images/file/25451927609.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/dupipivilowawazanere.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/42138520514.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/luvoxolesexibikoxavu.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/pevitazuguz.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/ketasefinisigugevodibisef.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/sofajawadimibitubeg.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/xakubunelefab.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/sebomikapabevilukimis.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/saperuxobepasevig.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_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 20172 bytes
SHA-256: b7e94ef4932344a9c79fb314a761261defaa2062647ba8852b73d744c1c5e84e
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 11068 bytes
SHA-256: 2990c6c1ab243dc4f95c8f97209218eab0fda9aefb7732371a88facf9ef5a636
font_02_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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