Malicious PDF — malware analysis report

Static analysis result for SHA-256 8803becabc89ecd4…

MALICIOUS

PDF

41.8 KB Created: 2020-03-30 10:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fbab449cad130e6e1c42050db410db1d SHA-1: 7db42d01f4bbe38a9ddd6d0f0ca27bf781ad56ad SHA-256: 8803becabc89ecd444f43baa19c88feb9478b765037271b886cf5d1062dc5a54
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a 'link farm' heuristic. The document body, though heavily obfuscated, contains URLs that are also present in the list of extracted links. This suggests the primary purpose is to redirect users to a network of sites, likely for SEO spam or to serve malicious content. No scripts were extracted, but the PDF structure and link farm behavior are strong indicators of malicious intent.

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://michaelshusko.com/uploads/1/3/1/4/131453045/131453045.html#mantenimiento+industrial+definicion+autores
    • http://dominionmortgagelc.com/uploads/1/3/0/8/130814471/6e1066a7399ec8.pdf
    • http://rumseytownhall.com/uploads/1/3/1/4/131453588/6636643.pdf
    • http://vitruvianscales.com/uploads/1/3/1/1/131163780/a9dfd.pdf
    • http://peoplefollowingjesusworldwide.org/uploads/1/3/0/6/130604902/boxemisi-vajotew-wusakes.pdf
    • http://naramataplayschool.com/uploads/1/3/0/8/130813546/jevak.pdf
    • http://mypainrelif.com/uploads/1/3/0/7/130738732/e6161d8bbd9ace3.pdf
    • http://www.proedge406.com/uploads/1/3/0/5/130551687/pataxifo.pdf
    • http://yearofsluttery.net/uploads/1/3/0/8/130874492/fufogeta-lupisavolidano-lidubo-zafagenok.pdf
    • http://cockburnarchitecture.com/uploads/1/3/0/5/130543276/f1032ef3dae2.pdf
    • http://a-custom-esl-tutoring.com/uploads/1/3/1/3/131379716/nojejagux_dadidepolube_lunedavised_bopodabi.pdf
    • http://wilkinsjewellers.com/uploads/1/3/0/8/130814293/61fc2be.pdf
    • http://namdalseidmusikklag.no/uploads/1/3/1/4/131408459/2889441.pdf
    • http://bellabkc.com/uploads/1/3/0/5/130589231/gofisemagedijexam.pdf
    • http://folliday.com/uploads/1/3/0/5/130589137/sijan-notapo.pdf
    • http://mobilpapershredding.com/uploads/1/3/0/7/130775137/1ab832d577.pdf
    • http://thefijimissionschool.org/uploads/1/3/0/9/130969169/nobupoza.pdf
    • http://endoflifedoula.co/uploads/1/3/0/9/130969976/8aeafd0.pdf
    • http://aureliakbrown.com/uploads/1/3/0/7/130776541/682aca.pdf
    • http://wickedhousewife.com/uploads/1/3/0/2/130272282/f78f357b67b.pdf
    • http://lazarushandplane.com/uploads/1/3/0/8/130813054/42dba79eb.pdf
    • http://whosinyourtribe.com/uploads/1/3/0/5/130539818/746d93359fe19.pdf
    • http://oldsettermusic.com/uploads/1/3/0/6/130605452/pujabuzipera-pitudali-sobeloxomu.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_off000077cf.bin
0f85669b0195e251143dad76bd3e98cf4b4100efd909c9f224859d32cb02c57d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CF 8684 bytes

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