Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a45db6891acf3db…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 11:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9897a15483a8c459d48c445cb76ddeef SHA-1: be75e5b464658855b628a0cb6555c2c4b8308950 SHA-256: 4a45db6891acf3db7eb3faa306a04e92e24f87b62b648cd2d3ccab82905b626b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document points to numerous distinct hosts, suggesting a link farm designed to obscure the ultimate malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kotypsy.pl/ckfinder/userfiles/files/jesaxarebur.pdf In PDF document text
    • http://taiwan-casters.com/userfiles/file/94974270006.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/turaxifufalejukumu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142f441ccbf7---xekuseloxexafukada.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/44772298390.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/90934684239.pdfIn PDF document text
    • http://tfforming.ru/d/files/beladenerofosode.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/vutijoxepozobidijagosaxo.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/bavobivufexuzebigexu.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/zuwikotufonadawolelur.pdfIn PDF document text
    • http://artdental.hu/editor_up/titimagapupujiralarizu.pdfIn PDF document text
    • http://skncn.com/u/files/xabewedurav.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/35610551287.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/54075321520.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/teravenobanenat.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/36475094573.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/jowux.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/rolalozusew.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/50558341975.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbbe18de2---21914638445.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/31669591285.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/99093061723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+emulator+for+low+graphics+cardPDF 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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 17048 bytes
SHA-256: 6e11b64514a72d5a10d00c30a9eba39f2b532b9b3fefe056b31abeb3d0264edf
font_01_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 11232 bytes
SHA-256: 3b827c97315bd7fdbb584d94cc1c065c67c99914700cc4afee3ee9638674f668
font_02_sfnt_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1