Malicious PDF — malware analysis report

Static analysis result for SHA-256 8131b408520b3621…

MALICIOUS

PDF

71.1 KB Created: 2021-10-08 05:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d35242b82eeb70e3c01013280c34862e SHA-1: e8ec6c9e127188b2388e7ce4b71b1abed9c046a6 SHA-256: 8131b408520b3621d075d5f21d2852c87eaf77159d60012e3bd4ddfe44d456c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or scamming purposes. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://studiomarcheluzzo.it/userfiles/files/25996038072.pdf In PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/mejosutelulelugapufuxafa.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-20/20210920120146157597.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/rumugenugubobugejatem.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/lanewexa.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1633489498.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/52523269531.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/zawuranijewugi.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/51726618977.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109042054275645.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/vekazopafafusiv.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/47995504086.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c93e004a8---vipivatiga.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///sumefazumikubudokibolivof.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/28567483976.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/93855353385.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/51466813701.pdfIn PDF document text
    • http://zeci.nl/im/image/kivopamabimu.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090415544724.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/23758182716.pdfIn PDF document text
    • http://lobi.md/userfiles/file/rigamaliluzivipijiwix.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xoxokipiwowimax.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/zariverazojefan.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/605653575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lexical+analysis+in+compiler+designPDF 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_off0000b4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D1 10932 bytes
SHA-256: 7dbbe9abb9e474c2af762c8fb098a4e95a3fb4ad803fec805ef71f845713b8ed
font_01_sfnt_off0000cde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE8 15776 bytes
SHA-256: 4fb62ba4f3f2bf3c9200ba705d5f086ffed0d3eb8cc9f94bedf7c1df6c5b01a0
font_02_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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