Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b83ba17a868ac17…

MALICIOUS

PDF

41.0 KB Created: 2020-04-14 03:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6c6fcec35f4ccae2abe5ef3a8ad7ed91 SHA-1: b93f467fc26fa23019a91726d306119bbe638fa6 SHA-256: 7b83ba17a868ac17e57038acf4650e25163cd355616dbcc8bcb75cb156cf2273
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, suggesting a link farm or redirection scheme, and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, contains references to 'Heroku pg backups' and URLs that likely lead to further malicious content or phishing pages. The presence of numerous external links and the ML detection strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://flipnfunmats.com/uploads/1/3/0/7/130739012/130739012.html#heroku+pg+backups
    • http://myknitlife.com/uploads/1/3/0/5/130551004/pajedop.pdf
    • http://ooirvie.com/uploads/1/3/1/3/131380983/4482869.pdf
    • http://mirazaslove.net/uploads/1/3/1/1/131163664/5881441.pdf
    • http://costaparadiso.holiday/uploads/1/3/0/5/130544138/dekakowotevakude.pdf
    • http://iranconsaru.com/uploads/1/3/0/5/130541000/2c3d4aba3.pdf
    • http://richbizpoorbiz.com/uploads/1/3/0/2/130289172/2523335f22c280f.pdf
    • http://mspokrantsband.ca/uploads/1/3/0/7/130738638/semizosulizo.pdf
    • http://katherinewolff.net/uploads/1/3/0/3/130323461/099646.pdf
    • http://sarahlawrencecomedy.com/uploads/1/3/1/4/131437885/c39f9423.pdf
    • http://unitedbookkeeping.net/uploads/1/3/1/3/131398424/d5e930ca9.pdf
    • http://growgreenacres.net/uploads/1/3/1/3/131398085/zejamogibuwim-kegufek-tewomowonokin.pdf
    • http://bizsupportservices.com/uploads/1/3/0/6/130604557/sigozuf.pdf
    • http://ramoslandandcattle.com/uploads/1/3/0/2/130289301/79fb6e9b201ff2.pdf
    • https://${S3_BUCKET_NAME
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000749c.bin
48c232bc428129af0e8141d3c96fcb1a77e2ec62ae30936cd63b74ebf7bb0c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749C 9436 bytes

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