Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f461e2118c261fe…

MALICIOUS

PDF

43.2 KB Created: 2020-03-24 09:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f5244ddf311a84fddfc456b728746e2a SHA-1: 1c2db1d975dcc66345f62268ebfefd5c8626be87 SHA-256: 3f461e2118c261fe98c90cf17407bde8754e31d9231b8050f148af35d53cee7c
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 of which are dynamically generated and point to PDF files on unrelated domains. This behavior is characteristic of a link farm or SEO manipulation tactic, designed to drive traffic to potentially malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious link distribution.

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://bullardpatents.com/uploads/1/3/0/8/130815008/130815008.html#normas+de+seguridad+e+higiene+para+ensamblar+una+computadora
    • http://www.handbags-by-rosa.com/uploads/1/3/0/2/130270958/xanomapipedudezun.pdf
    • http://mimigoesketo.com/uploads/1/3/0/5/130551125/0737fe868ca.pdf
    • http://dessmuir.com/uploads/1/3/0/7/130776737/diboduvumabafen_perizinuva.pdf
    • http://www.shotfootrecords.com/uploads/1/3/0/2/130288567/vanaretelufetosoju.pdf
    • http://www.financialcreditspecialist.com/uploads/1/3/0/2/130288707/wibaxugusekewot-janudovum-madesakepusab.pdf
    • http://netherplay.org/uploads/1/3/0/7/130738693/5937689.pdf
    • http://wolstenholm.com/uploads/1/3/0/7/130739061/lovegitevu.pdf
    • http://discovermyawesomeness.com/uploads/1/3/0/5/130590741/xigiteguwozajimil.pdf
    • http://nativetouchnatural.com/uploads/1/3/0/7/130739330/e4919fc4d6.pdf
    • http://fecresources.net/uploads/1/3/0/3/130313220/0b1501056.pdf
    • http://travelerswine.com/uploads/1/3/0/3/130324065/5788569.pdf
    • http://ladieslearnenglish.com/uploads/1/3/0/6/130621473/tedugiwaraf-wofomewipakit-disolu-pebavoditilap.pdf
    • http://littlelash.com/uploads/1/3/0/5/130588393/239885.pdf
    • http://wu2fx.bpmtc.com/uploads/1/3/0/2/130288458/kolitufororosereg.pdf
    • http://wanderus.com/uploads/1/3/0/6/130604807/mixemit.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_off00007dbb.bin
49881d98860312b62ccfde3574345c10240f39ee954adff099c3d84285b4a9dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBB 8724 bytes

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