Malicious PDF — malware analysis report

Static analysis result for SHA-256 badb767a11168b49…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 02:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6085d0572fc4d56f1b345a380b6d8a48 SHA-1: 2f8a77880998b210f172cca2b07e80cc7c249d25 SHA-256: badb767a11168b49a663275d4bd1de3fdc7d42874608e6a61b523f42cf48c790
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 presence of embedded JavaScript and numerous external URLs, including one directly on an IP address, strongly suggests that this PDF is designed to download and execute a second-stage payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by indicating the use of numerous disposable domains for hosting potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://baggiez.net/userfiles/file/fekolirufafugiwaxexuvonoz.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133d59e5da54---91908041379.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/28737879787.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/44240279652.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210913062229.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/98736035825.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/50589321233.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/gisidelasuzux.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/91150408145.pdfIn PDF document text
    • https://spacio.hk/attachment/file/11982919922.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/35028312011.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/gagijulivetozel.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/41027144784.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/21957318039.pdfPDF link annotation
    • http://ohdiabo.net/images/ckeditor/files/wuwavumamezax.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/korosujesax.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/18636037098.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/nokesirotoxelojuzebotafef.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614664dddb19a---99730345809.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/1038600851.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/31930303302.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/jisubujukiwor.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/79951601164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=higgs+domino+appPDF 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://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_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 18672 bytes
SHA-256: 774a195b71bc2902a74723a47fa7555ba01ba5c0e54fc35697d4b0d559385461
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 10352 bytes
SHA-256: 8f25dc286357a3e1f1c141da1545c68eed2fd912db091bdce72a9919f5cfc8a0