Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86fecd677b51a31…

MALICIOUS

PDF

74.3 KB Created: 2021-09-12 08:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b2de426aeaec85c4c5def1ec53d7b9f8 SHA-1: 106eb2893fcf8eb1b027c8be73eb524d2b787780 SHA-256: d86fecd677b51a316ff4ec9b64ea196f0bc4c5a7f9e99bbdc6d9da6e6e42631d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://museodegliarazzimarsala.com/userfiles/files/42801964399.pdf In PDF document text
    • https://martabaktelor.com/contents/files/2475008940.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/90688266857.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/nifagizekijazixuxuz.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9d698251b86de2360855d6a633b1d9fb/71645059388.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/48139643873.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/jifef.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/61819663053.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/vomituweviv.pdfIn PDF document text
    • http://onelove.cz/file/wudesanabuvifavejir.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/fepadozoloro.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/73060449508.pdfIn PDF document text
    • https://ienter.bg/files/89782501029.pdfIn PDF document text
    • http://merydian.pl/nowymerydian/userfiles/file/4162995672.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/dapudiguwujobamenore.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/badusupojuvedafe.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/lisoputitul.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/mixit.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/parudademizagojesovuxoxug.pdfIn PDF document text
    • http://topp.pl/_topp/file/betotapajexifotorigu.pdfIn PDF document text
    • http://nemochem.cn/upload/files/welinazesix.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210912075505.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/97565296439.pdfIn PDF document text
    • https://terracell.pt/images/file/96660019835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+hacked+client+mobilePDF 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_off0000be50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 10800 bytes
SHA-256: 5ff5910c84fa78a662b3d5cf05a719bc9ed3113d0502cdb98bf2b1ef88d1e434
font_02_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 17196 bytes
SHA-256: 579ffe622cfefabb1ade2981606f9e08bd3338da3d321242fa9d3b410f589cd1