Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7c386cd3d1d742…

MALICIOUS

PDF

47.7 KB Created: 2020-06-04 13:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a9a22c11a59e1985cb2a0b4a7c360c6 SHA-1: cfdb9351518016fdb2137b918bd037ac621e57be SHA-256: ab7c386cd3d1d7423d144b74f5ed2ca1faf1d6dbc2e00ffd3a5ef2473e71cf51
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to domains designed to appear legitimate but host potentially malicious content. The 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of a PDF link farm strongly indicate malicious intent. The document body, though obfuscated, contains text related to 'guitar sheet music for beginners', suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://xinpujingyulechengruhecunkuan.br3h.com/uploads/1/3/1/0/131071021/131071021.html#guitar+sheet+music+for+beginners
    • http://lovegiveserve.com/uploads/1/3/0/4/130488512/sopumunirez-talevamonebat-mexegi-nanus.pdf
    • http://autodiscover.thatguyspeaks.com/uploads/1/3/0/4/130489222/bijupik.pdf
    • http://zilluettabyalma.com/uploads/1/3/0/5/130550968/2cbf77eeb8.pdf
    • http://xinpujingyulechengruhecunkuan.br3h.com/uploads/1/3/1/0/131071021/terms.html
    • http://xinpujingyulechengruhecunkuan.br3h.com/uploads/1/3/1/0/131071021/dmca.html
    • http://xinpujingyulechengruhecunkuan.br3h.com/uploads/1/3/1/0/131071021/policy.html
    • https://piwigaf.files.wordpress.com/2020/06/vawedigimosose.pdf
    • https://mowugowewuv.files.wordpress.com/2020/06/16546563620.pdf
    • https://woraletavaj.files.wordpress.com/2020/06/vakumosutedox.pdf
    • https://kewewigo.files.wordpress.com/2020/06/70030572006.pdf
    • https://tazesetinud.files.wordpress.com/2020/06/kigitagopiwan.pdf
    • https://damiponan.files.wordpress.com/2020/06/josuzakidipekurog.pdf
    • 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_off00008bfe.bin
6a43dda004eafab28545ff876818f59e79b61a6c0c3109783fd49323421348f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFE 12896 bytes

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