Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5e6f87995d8625…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 12:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab0e44881ca491e232b9dcb70c80c5d0 SHA-1: f14e28958529722976ff8bb0b29042eae5a1deea SHA-256: cd5e6f87995d8625f17b597d8d5ce9bfe8d6d3fc0883a027e321b9af94b84285
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=rupaul%27s+drag+race+season+8+123movies PDF link annotation
    • http://asiadomainstore.com/userfiles/file/67085701480.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/42440077966.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/lodiv.pdfIn PDF document text
    • http://mutitar.com/user_img/files/jedanomebex.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/ganalemejur.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/lirexogeredilafirunuvore.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/tawezejakopotipulopuxexa.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/53843396379.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/29183194004.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/sugudipixitebunibewesa.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/lakegarima.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/penaxazulemimun.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210902192244.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/51230816501.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/92650366962.pdfIn PDF document text
    • https://magerp.org/upload/files/gibegafukofuzekujisuzeso.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/9cc6679754cce3ad1b1417832fdb22b2/nivivovowe.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/xetagazakuvoxazerekipat.pdfIn PDF document text
    • http://vuason.vn/upload/files/31665963116.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/49053030674.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/67962047455.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427e243bfa6---85565721589.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/22407449053.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/wazukemi.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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 11556 bytes
SHA-256: 30308106d488e265dc0f43139b939c6f81a543b0b95ce4c47eaa860bf72e683a
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 17952 bytes
SHA-256: 0b5c8d0ef1c0deadd2094bf3a6a0ce2931657a104f552c5ed021e0608f860f65