Malicious PDF — malware analysis report

Static analysis result for SHA-256 87eda214aeb35c87…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 11:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 509b82fd9fe2695840c9a4f88272d06c SHA-1: 22ef59a145cd94a1aaf2d65f2c3f167c624b6a43 SHA-256: 87eda214aeb35c87b9fe57251d1245af1758a2d9292b0c90a344c21227486ac1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a non-clustered link farm on disposable hosting, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://corpus.bg/files/fck/file/36054018498.pdf In PDF document text
    • http://shahnawazonline.com/uploads/files/62112675607.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/24469591887.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/nimoxibapamikifavoju.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/29688936389.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/11495612034.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/76071031968.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/58637174680.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/44710221552.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/38406453640.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/zarovafimabitudosoge.pdfIn PDF document text
    • http://ip-kamery.cz/files/file/bixuremadaporoxazafaje.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/venoxemonajepuf.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/balunopazejilopaseluz.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/64671817938.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/jegaxoperowuluvuja.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/gakugoxapemaxokevuvid.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133e549be8e2---birilivaxexusifuranuf.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///pepebuxilosos.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/48bd159d2b583d5158e3750e2390f162/59253194047.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/rimoj.pdfIn PDF document text
    • http://schturman.ru/files/files/32773964501.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/17974568509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+mfa+app+androidPDF 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_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_02_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 10664 bytes
SHA-256: d638307d62d55ba8f204891acca17724695b540ea863a4dfd5f09f4081532e70

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