Malicious PDF — malware analysis report

Static analysis result for SHA-256 468a68d543df0e64…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 18:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1334fd7d01e3427388a87705267fae62 SHA-1: d8268f9315fe05fc9c8ebc9de9854720818193d2 SHA-256: 468a68d543df0e64d7420e75f57be66429b8559740eeed0c5c33f9785416ce37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://npk-bypassdrr2.com/file_media/file_image/file/likarijopubogajapet.pdf In PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/85687308378.pdfIn PDF document text
    • https://negaratoto.com/contents/files/werizoriwotawazajasita.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/79866996822.pdfIn PDF document text
    • https://estoniapools.com/contents/files/85368852048.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/4381565197.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/41979938717.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/3451498546.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/15792130747.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/gagufeso.pdfIn PDF document text
    • https://robodom.si/files_vsebine/gipaj.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/83728007908.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210908145025.pdfIn PDF document text
    • http://sayarbobinaj.com/file/90431209069.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/70528194361.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/72049424969.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/41355042335.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/30644165582.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/ziwigegonopudif.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/xivebugirosiruxufete.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/42934087662.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/59415582182.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/81510400404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=games+similar+to+final+fantasy+tacticsPDF 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_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 18968 bytes
SHA-256: d380131ea863e7fab39be0a608fd390c0ecdec4e7bad130b17dee847b30017ce
font_01_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 10652 bytes
SHA-256: 37caa90105b1c5fe995e7eec293091674e091ac826a273baf0eb4aa1250a42f9
font_02_sfnt_off0001245e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1