Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fa2db661e0aa18…

MALICIOUS

PDF

81.0 KB Created: 2020-06-14 00:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6362ce2adb09bc9d93343c2542bdf57 SHA-1: 715dbc4ab485c1051943f4a7ee2abc12dcf95f3f SHA-256: 56fa2db661e0aa18597bf9e205870e85be72bd8be45836bd40b5355b57bf6c12
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary lure appears to be related to 'whatsapp' based on the URL fragment. The ML classifier also strongly flagged this PDF as malicious. The embedded links likely lead to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crystalgardens.co/uploads/1/3/2/3/132302941/132302941.html#%25D8%25AA%25D9%2586%25D8%25B3%25D9%258A%25D9%2582+%25D9%2581%25D9%258A%25D8%25AF%25D9%258A%25D9%2588+whatsapp
    • http://biolojia.com/uploads/1/3/0/4/130489527/416c4dc6a8dbfb.pdf
    • http://posts.stbcoaching.be/uploads/1/3/0/6/130621113/pexanumatavug-robefasa-newomeged.pdf
    • http://74-123-73-207.mgwnet.com/uploads/1/3/0/3/130323329/numotopar.pdf
    • http://webmail.digcitinstitute.com/uploads/1/3/1/0/131070167/vopotuja.pdf
    • http://mrkplastics.com/uploads/1/3/0/8/130874641/18f9240.pdf
    • http://blueberrycottagerental.com/uploads/1/3/1/4/131452880/piromevepunemuj.pdf
    • http://74-123-72-187.mgwnet.com/uploads/1/3/0/4/130476628/filotume_mitev.pdf
    • http://fearlesssocial.net/uploads/1/3/1/4/131437350/3228791b6c9.pdf
    • https://wixobesabad.files.wordpress.com/2020/06/45016892335.pdf
    • https://puwadoxer.files.wordpress.com/2020/06/nonusovirugawavapi.pdf
    • https://wekogutew.files.wordpress.com/2020/06/360654390.pdf
    • https://tupakagos.files.wordpress.com/2020/06/4807242119.pdf
    • https://vujovax.files.wordpress.com/2020/06/pexoluzumavagisuxux.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000dc0b.bin
ca1f952ad9bed75ad4829f9c16456e3e487f58ba71031a97c6e7279c55c247b3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDC0B 32900 bytes
font_01_sfnt_off00011623.bin
720d3af7a107e78531a698c3a1f70292403a83f2ae112c5117b4d865046275e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 9244 bytes

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