Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de3574859e8d4b9…

MALICIOUS

PDF

72.1 KB Created: 2021-10-05 11:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00588c39b640249015ed22ea65c2331a SHA-1: 7e5ead2bd0dd926e96d033a78bdaa29dcd9a55a4 SHA-256: 6de3574859e8d4b9d1a102336a920a0ddc49511f0320eedfa104c0ccbafc393a
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. It also features a high number of external URIs, many pointing to potentially compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://studiotecnicomaglio.it/userfiles/files/31450608535.pdf In PDF document text
    • https://xuanhongkhang.com/upload/files/divadovuroxomada.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/43127580869.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/67851847456.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/54046671309.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/vufipejusat.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/81032547470.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/xutozuduzasipamoki.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/juranevofoweboniju.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/35417508898.pdfIn PDF document text
    • https://phr4u.com/files/vulipigutedafunabutital.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/34822693377.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/naxulunam.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/45877871282.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kadesuzojuzisosikana.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/61623455009.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/25773722475.pdfIn PDF document text
    • http://ipceurope.be/assets/file/46121169289.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331e166b6dd---jatujebasilifudux.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/niriviwikezufegerenixek.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/rafosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=accidental+dismemberment+meaningPDF 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_off0000b921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 16392 bytes
SHA-256: aef948cfcf59bc42787ef4d2a5ae3eed5cab061172e653de0a5141e2339f8aa7
font_02_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 10716 bytes
SHA-256: 0a526c8fe874868081f975022854bfcc73886b0ca25e1fe23f63c9b0ecc43240

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