Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d63188a5b90243f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 13:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efdf861f75fd29ee5fbc1add943d8e51 SHA-1: 268ef8080fdc8c6748d893983c35e629b77767be SHA-256: 2d63188a5b90243f3952824f04393f4049dd7693fce10b223b821cfbc9ef4553
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as evidenced by the numerous unknown-reputation URLs found within the document, which are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://ljjxmining.com/uploadfile/file///2021091701023236.pdf In PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/gazar.pdfIn PDF document text
    • http://kftchem.com/upload/files/gaxuwimawipunamuropom.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/84765006488.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/5051916894.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/pevatazuri.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/3151407486.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/vigutatesuzarafeguxaz.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/zixuvefimulirukeroxujalag.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/16215578873.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a2e21415---japumiruw.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/33226201938.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/kasuliloxage.pdfIn PDF document text
    • http://fgosvo.ru/files/files/49863450026.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/96241060379.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/rumikudalijovepafe.pdfIn PDF document text
    • https://netpage.info/userfiles/file/48923845815.pdfIn PDF document text
    • http://songchanraccomposite.com/upload/files/selinotarovaragevako.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210916092219.pdfIn PDF document text
    • http://orlickachata.cz/files/files/53526882545.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/xepuxeretetivezagemo.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/62277394118.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/65818089851.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210918022946_83ficn.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/bapilusovimexesat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=redmi+y3+vs+redmi+9+primePDF 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_off0000b35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 16292 bytes
SHA-256: d12ff2e08cc8c2b43c3a542775217d301e1dc8a37a3b131aed19d062e2180b3c
font_02_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 10588 bytes
SHA-256: caa25ca8224638a1c5b84b02b61ea87c54203a6b4eefde00e5e4a01884095072