Malicious PDF — malware analysis report

Static analysis result for SHA-256 170ac88427a1e505…

MALICIOUS

PDF

62.9 KB Created: 2020-04-07 13:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25ff534684cc54ac21ad144cffcb7ae6 SHA-1: dc854330efdb559b6d67cdd1db0a610670601608 SHA-256: 170ac88427a1e50557c6bb5ed972ebf5e7c737bd22a796e09b2c1f07b0a6ada7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier strongly indicates maliciousness. The embedded URLs suggest a link farm or content distribution network, likely intended to redirect users to malicious sites or download further payloads.

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://qwyzer.org/uploads/1/3/0/8/130874467/130874467.html#tipos+de+enlaces+ionicos+covalentes+y+metalicos
    • http://utmb-phto-ms.info/uploads/1/3/0/5/130588206/lekusefifepem.pdf
    • http://aesthetiderm.com/uploads/1/3/0/4/130489052/kijas.pdf
    • http://mwoc.us/uploads/1/3/1/4/131452963/xosuzodu.pdf
    • http://appabledigital.com/uploads/1/3/0/6/130622032/87e4847c1a.pdf
    • http://robbietech4teach.org/uploads/1/3/0/5/130543169/zewozo_ledafu_fexeregiboxad_zejadaromow.pdf
    • http://munding-pr.com/uploads/1/3/0/5/130547150/wunog.pdf
    • http://preventive.biz/uploads/1/3/0/6/130621630/nemowuxonukojira.pdf
    • http://missmoes.be/uploads/1/3/0/6/130603931/labivegoxuzudexilax.pdf
    • http://stormywaterscoaching.org/uploads/1/3/0/4/130488530/7456206.pdf
    • http://frenchtoursbylocals.com/uploads/1/3/1/4/131406861/vikabajejidebale.pdf
    • http://paulwilkinson.net/uploads/1/3/0/2/130287939/c6ff30908b48779.pdf
    • http://bloomindesign.nl/uploads/1/3/0/4/130476082/6302213.pdf
    • http://uytravel.com/uploads/1/3/0/2/130271072/sovelisilakal.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b285.bin
3f1b6864782ded9ed8f60929cada3a2b4789acf728e15dca9437eca738bd1add		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB285 9840 bytes
font_01_sfnt_off0000d62f.bin
fc78370cfda3dff8d703bd96b00418a91af6db7a831a448baa24124c99fcf727		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62F 16152 bytes

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