Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfbf7dee1326dba…

MALICIOUS

PDF

73.3 KB Created: 2021-09-13 06:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c62f050d04ec616b702857bf8ff25657 SHA-1: 1fdd4e8d7a31603eb6856455cd1c5e6fe4c2384e SHA-256: 5bfbf7dee1326dba4e4442bbb1fd51ea9906268b7117cb40c1514c88c918995a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript to facilitate redirection or exploit delivery, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://icoenergia.com/userfiles/files/37727643763.pdf In PDF document text
    • http://dalboncostruzioni.it/userfiles/files/xaxinorododipedakilix.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/zazitebimapa.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/85345136360.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/timigodowokirigo.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/figixoniv.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/24296695593.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/48069431784.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/ripojoz.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zutunenavavixevuruxarek.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-13/images/files/12993631639.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///vogemodibive.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/53235971691.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/pejafifafesuligufazibafu.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/wanaridijegok.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/xokofakamovufofat.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe91c7c83---ritedigulagazebuxakodux.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1eac59d9---dexememupokokumiwewikulis.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/xoxisobabar.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/54828404330.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/75232914311.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109122245173316.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/mufuwoxurewod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=top+5+largest+economies+in+the+worldPDF 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_off0000bc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1D 11144 bytes
SHA-256: 8398096cac4b86f325e2fb0ca5ed17cb07346188ae50495352e448cf47955f2b
font_01_sfnt_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 16128 bytes
SHA-256: 56cdd4f5848e60b5fc4fafeb6492a5c23e2b3523bb7021c5dd08e64a2671a48b

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