Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28cb988b21914ad…

MALICIOUS

PDF

74.3 KB Created: 2020-03-22 11:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb54716bd2a320c2b4249862a1340423 SHA-1: e600b59f309e3812704ad9906bff7b00a35c1792 SHA-256: a28cb988b21914ad28b8c07458c524e5e5a934e90df413ba5eaa45c0969fbdd8
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicative of a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains a URL that is also present in the list of external links, suggesting a deliberate attempt to redirect users to malicious content.

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://seizediem.com/uploads/1/3/1/0/131070688/131070688.html#bibliografia+de+un+ensayo+del+aborto
    • http://www.musclegear-asia.com/uploads/1/3/0/6/130621223/8be4df7b54f4f.pdf
    • http://www.gucra.com/uploads/1/3/0/6/130621006/e89adbc3035c0.pdf
    • http://www.mrdbmitchell.com/uploads/1/3/0/7/130738553/rakariwev.pdf
    • http://truthbeshonefilms.com/uploads/1/3/0/5/130544754/warinaliz.pdf
    • http://www.votesmith-tyge.com/uploads/1/3/0/3/130313445/gamesamabekoja.pdf
    • http://foundryrents.com/uploads/1/3/0/7/130740192/sukavepaxaduzot_nivunevolas_wadukizevef.pdf
    • http://kraftsoutdoorfurniture.com/uploads/1/3/0/4/130488213/regilumolirifofalis.pdf
    • http://mythinkando.com/uploads/1/3/0/7/130776805/c18b69081.pdf
    • http://www.samarecords.com/uploads/1/3/0/5/130589035/2807023.pdf
    • http://southlandgun.net/uploads/1/3/0/7/130739073/4268154.pdf
    • http://boatletteringcleveland.com/uploads/1/3/0/7/130739233/8f4e6a66.pdf
    • http://www.jimmyscribbles.com/uploads/1/3/0/2/130272937/gejefufano.pdf
    • http://www.21fds.com/uploads/1/3/0/6/130604340/donutedemer_rovinawutebebuw_nokel_guliwuxowome.pdf
    • http://33grp.com/uploads/1/3/0/4/130491444/gikumemasapolurad.pdf
    • http://www.glamwear.net/uploads/1/3/0/7/130739322/e39f7134ab.pdf
    • http://morecleanlessdirty.com/uploads/1/3/0/3/130313306/7068456.pdf
    • http://mercy-reigns.com/uploads/1/3/0/6/130605165/7779044.pdf
    • http://spiritfestfl.com/uploads/1/3/0/6/130621569/137820.pdf
    • http://memofortherecord.net/uploads/1/3/0/6/130604141/f0a8ed7402.pdf
    • http://drazenillus.com/uploads/1/3/0/2/130288441/8007564.pdf
    • http://www.wildchattanooga.org/uploads/1/3/0/5/130589214/sipapekepux_janamomeber_xukatediwojaka.pdf
    • http://newsolutionsit.com/uploads/1/3/0/7/130775797/1465648.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d985.bin
75cc2854c42364bc03f9f34c7b8a48fe9ed72d7ff489e12b180a4499b6986e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 1784 bytes
font_01_sfnt_off0000e1a5.bin
a47fe7a072d70fb804760489872248c70f93b7c088049c62079d1d9eb62bfbd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 9628 bytes
font_02_sfnt_off00010321.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16204 bytes

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